(106 days)
No
The description focuses on calculating a ratio (dPR) based on pressure measurements during a specific portion of the cardiac cycle. This is a deterministic calculation, not indicative of AI/ML. There is no mention of learning, training data, or complex algorithms typically associated with AI/ML.
No.
The device measures pressure for diagnostic purposes and does not provide therapy.
Yes
Explanation: The "Intended Use / Indications for Use" section states that the device provides "hemodynamic information, such as fractional flow reserve, for the diagnosis and treatment of blood vessels." Additionally, the "Device Description" mentions that the dPR calculation is "a resting index for the diagnostic of the severity of stenosis."
No
The device description explicitly states that the OptoMonitor is composed of three parts: the Hybrid Cable Unit (HCU), the Signal Conditioner Unit (SCU), and the Display Unit (DU). It also mentions that there are no changes to the device hardware (HCU and SCU) from the previously cleared version. This indicates the device includes hardware components in addition to the software.
Based on the provided information, this device is not an In Vitro Diagnostic (IVD).
Here's why:
- IVDs are used to examine specimens derived from the human body. The intended use of this device is to measure pressure in blood vessels during procedures, not to analyze samples taken from the body.
- The device description explicitly states it is a non-patient contact device. IVDs typically involve analyzing biological samples.
- The measurements are taken directly within the blood vessels. This is an in-vivo measurement, not an in-vitro (in glass/laboratory) measurement.
The device is a diagnostic tool used during medical procedures to assess the hemodynamics of blood vessels, but it does so by directly interacting with the patient's circulatory system, not by analyzing a sample in a lab setting.
N/A
Intended Use / Indications for Use
To measure pressure in blood vessels including both coronary and peripheral vessels, during diagnostic angiography and or any interventional procedures.
Blood pressure measurements provide hemodynamic information, such as fractional flow reserve, for the diagnosis and treatment of blood vessels.
Product codes
DXO
Device Description
The proposed OptoMonitor is a software upgrade that includes software modifications allowing for the calculation of dPR index, and revised labeling relevant to this change. This device and its components are considered accessories to catheter pressure transducers and are intended for use with legally marketed catheters.
The OptoMonitor with the new dPR calculation is an upgraded version of the software embedded in the previously cleared OptoMonitor's Display Unit. The OptoMonitor comprises the exact same hardware as cleared version with most of the software remaining unchanged, except for the display unit software which in addition to the current calculation of Fractional Flow Reserve (FFR), the upgraded version will also calculate the diastolic pressure ratio (dPR).
dPR is a resting index which consists in calculating the ratio of Pd and Pa over the diastolic portion of the heart beat cycle. dPR is a resting index for the diagnostic of the severity of stenosis equivalent to iFR (instantaneous wave-Free Ratio). iFR calculates the ratio of Pd and Pa over 75% of the diastolic portion.
The OptoMonitor is composed of 3 parts: The Hybrid Cable Unit (HCU), the Signal Conditioner Unit (SCU) and the Display Unit (DU). There are no changes to the device hardware (HCU and SCU) from device system cleared under K142598. The device is a non-sterile, non-patient contact device.
Mentions image processing
Not Found
Mentions AI, DNN, or ML
Not Found
Input Imaging Modality
Not Found
Anatomical Site
blood vessels including both coronary and peripheral vessels.
Indicated Patient Age Range
Not Found
Intended User / Care Setting
Not Found
Description of the training set, sample size, data source, and annotation protocol
Not Found
Description of the test set, sample size, data source, and annotation protocol
Not Found
Summary of Performance Studies (study type, sample size, AUC, MRMC, standalone performance, key results)
The accuracy, specificity and sensitivity of dPR compared to iFR as a reference standard, using the same cut-off value of 0.89 and calculated from both CONTRAST and VERIFY 2 studies, are 97.1% [95.7%, 98.1% @95%C1], 95.9% [93.6%, 97.5% @95%C1] and 98.4 [96.6%, 99.3% @95%C1] respectively.
The diagnostic performance of dPR (cut-off=0.89) vs FFR (cut-off=0.80) compared to iFR (cut-off=0.89) vs FFR (cut-off=0.80) was also assessed. It was demonstrated that the diagnostic performance of dPR vs FFR is not statistically different from the diagnostic performance of iFR vs FFR, with 95% confidence interval significantly overlapping.
Key Metrics (Sensitivity, Specificity, PPV, NPV, etc.)
Accuracy: 97.1% [95.7%, 98.1% @95%C1]
Specificity: 95.9% [93.6%, 97.5% @95%C1]
Sensitivity: 98.4 [96.6%, 99.3% @95%C1]
Predicate Device(s): If the device was cleared using the 510(k) pathway, identify the Predicate Device(s) K/DEN number used to claim substantial equivalence and list them here in a comma separated list exactly as they appear in the text. List the primary predicate first in the list.
Reference Device(s): Identify the Reference Device(s) K/DEN number and list them here in a comma separated list exactly as they appear in the text.
Predetermined Change Control Plan (PCCP) - All Relevant Information for the subject device only (e.g. presence / absence, what scope was granted / cleared under the PCCP, any restrictions, etc).
Not Found
§ 870.2870 Catheter tip pressure transducer.
(a)
Identification. A catheter tip pressure transducer is a device incorporated into the distal end of a catheter. When placed in the bloodstream, its mechanical or electrical properties change in relation to changes in blood pressure. These changes are transmitted to accessory equipment for processing.(b)
Classification. Class II (performance standards).
0
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December 12, 2019
Opsens Inc % Chris Henza Regulatory Consultant Ultra LifeScience Inc. 872 S. Milwaukee Avenue #286 Libertyville, Illinois 60048
Re: K192340
Trade/Device Name: OptoMonitor Regulation Number: 21 CFR 870.2870 Regulation Name: Catheter Tip Pressure Transducer Regulatory Class: Class II Product Code: DXO Dated: November 8, 2019 Received: November 12, 2019
Dear Chris Henza:
We have reviewed your Section 510(k) premarket notification of intent to market the device referenced above and have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to legally marketed predicate devices marketed in interstate commerce prior to May 28, 1976, the enactment date of the Medical Device Amendments, or to devices that have been reclassified in accordance with the provisions of the Federal Food, Drug, and Cosmetic Act (Act) that do not require approval of a premarket approval application (PMA). You may, therefore, market the device, subject to the general controls provisions of the Act. Although this letter refers to your product as a device, please be aware that some cleared products may instead be combination products. The 510(k) Premarket Notification Database located at https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfpmn/pmn.cfm identifies combination product submissions. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration. Please note: CDRH does not evaluate information related to contract liability warranties. We remind you, however, that device labeling must be truthful and not misleading.
If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it may be subject to additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 898. In addition, FDA may publish further announcements concerning your device in the Federal Register.
Please be advised that FDA's issuance of a substantial equivalence determination does not mean that FDA has made a determination that your device complies with other requirements of the Act or any Federal
1
statutes and regulations administered by other Federal agencies. You must comply with all the Act's requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Part 801); medical device reporting of medical device-related adverse events) (21 CFR 803) for devices or postmarketing safety reporting (21 CFR 4, Subpart B) for combination products (see https://www.fda.gov/combination-products/guidance-regulatory-information/postmarketing-safety-reportingcombination-products); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820) for devices or current good manufacturing practices (21 CFR 4, Subpart A) for combination products; and, if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.
Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR Part 807.97). For questions regarding the reporting of adverse events under the MDR regulation (21 CFR Part 803), please go to https://www.fda.gov/medical-device-safety/medical-device-reportingmdr-how-report-medical-device-problems.
For comprehensive regulatory information about medical devices and radiation-emitting products, including information about labeling regulations, please see Device Advice (https://www.fda.gov/medicaldevices/device-advice-comprehensive-regulatory-assistance) and CDRH Learn (https://www.fda.gov/training-and-continuing-education/cdrh-learn). Additionally, you may contact the Division of Industry and Consumer Education (DICE) to ask a question about a specific regulatory topic. See the DICE website (https://www.fda.gov/medical-device-advice-comprehensive-regulatoryassistance/contact-us-division-industry-and-consumer-education-dice) for more information or contact DICE by email (DICE@fda.hhs.gov) or phone (1-800-638-2041 or 301-796-7100).
Sincerely,
Stephen Browning Assistant Director Division of Cardiac Electrophysiology, Diagnostics and Monitoring Devices Office of Cardiovascular Devices Office of Product Evaluation and Quality Center for Devices and Radiological Health
Enclosure
2
Indications for Use
510(k) Number (if known)
Device Name OptoMonitor
Indications for Use (Describe)
To measure pressure in bood vessels including both coronary and peripheral vessels, during diagnostic angiography and or any interventional procedures.
Blood pressure measurements provide hemodynamic information, such as fractional flow reserve, for the diagnosis and treatment of blood vessels.
| Type of Use (Select one or both, as applicable) | |
|---|---|
| ------------------------------------------------- | -- |
× | Prescription Use (Part 21 CFR 801 Subpart D)
Over-The-Counter Use (21 CFR 801 Subpart C)
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3
5 510(k) Summary
SUBMITTER 5.1
Address: Opsens, Inc.
750, Boulevard du Parc Technologique
Quebec (Quebec) G1P 4S3
Phone: 418-781-0333
Fax Number: 418-781-0024
Contact Person: Marc Chaunet, Director of Requlatory Affairs, Opsens Inc.
Email: marc.chaunet@opsens.com
Date Prepared: Auqust 23, 2019
5.2 DEVICE
Name of Device: OptoMonitor
Common or Usual Name: Pressure Monitor
Classification name: Transducer, pressure, catheter tip (870.2870)
Regulatory Class: II
Product Code: DXO
5.3 PREDICATE DEVICE
OptoMonitor System cleared via K142598 (cleared on 06/12/2015).
REFERENCE DEVICE 5.4
The dPR index calculation algorithm software upgrade subject to this submission is substantially equivalent to the reference device, Volcano iFR Modality cleared under K173860, cleared on 04/11/2018 for similar intended use.
DEVICE DESCRIPTION 5.5
The proposed OptoMonitor is a software upgrade that includes software modifications allowing for the calculation of dPR index, and revised labeling relevant to this change. This device and its components are considered accessories to catheter pressure transducers and are intended for use with leqally marketed catheters.
Page 1 | 6
4
Software Description
The OptoMonitor with the new dPR calculation is an upgraded version of the software embedded in the previously cleared OptoMonitor's Display Unit. The OptoMonitor comprises the exact same hardware as cleared version with most of the software remaining unchanged, except for the display unit software which in addition to the current calculation of Fractional Flow Reserve (FFR), the upgraded version will also calculate the diastolic pressure ratio (dPR).
dPR is a resting index which consists in calculating the ratio of Pd and Pa over the diastolic portion of the heart beat cycle. dPR is a resting index for the diagnostic of the severity of stenosis equivalent to iFR (instantaneous wave-Free Ratio). IFR calculates the ratio of Pd and Pa over 75% of the diastolic portion.
The accuracy, specificity and sensitivity of dPR compared to iFR as a reference standard', using the same cut-off value of 0.89 and calculated from both CONTRAST² and VERIFY 22 studies, are 97.1% [95.7%, 98.1% @95%C11, 95.9% [93.6%, 97.5% @95%C1] and 98.4 [96.6%, 99.3% @95%C1] respectively.
The diagnostic performance of dPR (cut-off=0.89) vs FFR (cut-off=0.80) compared to iFR (cut-off=0.89) vs FFR (cut-off=0.80) was also assessed. It was demonstrated that the diagnostic performance of dPR vs FFR is not statistically different from the diagnostic performance of iFR vs FFR, with 95% confidence interval significantly overlapping.
Hardware Description
The OptoMonitor is composed of 3 parts: The Hybrid Cable Unit (HCU), the Signal Conditioner Unit (SCU) and the Display Unit (DU). There are no changes to the device hardware (HCU and SCU) from device system cleared under K142598. The device is a non-sterile, non-patient contact device.
5.6 INDICATIONS FOR USE
To measure pressure in blood vessels including both coronary and peripheral vessels, during diagnostic angiography and/or any interventional procedures.
Blood pressure measurements provide hemodynamic information, such as fractional flow reserve, for the diagnosis and treatment of blood vessel disease.
COMPARISON OF TECHNOLOGICAL CHARACTERISTICS WITH THE PREDICATE 5.7 DEVICE
The proposed OptoMonitor with dPR software upgrade is substantially equivalent to the OptoMonitor System (K142598 cleared on 06/12/2015), the catheter (pressure quidewire) from the predicate device is not affected by this submission. The OptoMonitor Optical Unit (SCU), the Handle Unit (HU) and accessories (cables, power supply, etc) are not affected by this submission. The only change is a software
Page 2 | 6
An JER cut-point of 0.89 matches hest with an FFR ischemic cut-point of 0.80 with a specificity of 87.8% and st Johnson et al., "Continuum of Vasodilator Stress From Rest to Contrast Medium to A
B. et al.. "The VERIEY 2 Study (A Comparative Study of Resting Coronary Pressure Gradient Instantaneous Wave-Free Ratio
5
upgrade to the Display Unit (DU) and updated labeling (updated OptoMonitor Instructions for Use) to describe the additional software features. The proposed device and the predicate device are considered accessories to catheter pressure transducers and are coded as DXO.
Indications for the device remain unchanged from the predicate device.
The change does not impact the fundamental scientific technology of the OptoMonitor device. The change does not include modifications to the device's operating principle(s) or mechanism of action. The technological characteristics of the software upgrade raise a question concerning whether its performance can be expected to be equivalent to predicate device or completive products. Performance testing has confirmed equivalence. No new questions of safety and effectiveness were identified during review of Risk Management documentation or execution of Verification and Validation activities.
The identified questions of safety and efficacy apply to both the new device and the predicate and so the new device does not raise different questions of safety and efficacy. Therefore, the proposed device, OptoMonitor with dPR software upgrade, meets substantial equivalence requirements with regards to the legally marketed predicate OptoMonitor System (K142598 cleared on 06/12/2015) and reference devices, Volcano iFR Modality (K173860 cleared on 04/11/2018).
5.8 PERFORMANCE DATA
The risk management process has been used to evaluate the dPR software update to the OptoMonitor System in accordance with the quidelines set forth in ISO 14971:2007, Medical Devices - Application of Risk Management to Medical Devices. The risk analysis for the OptoMonitor with dPR has taken into consideration the medical device vigilance data of predicate device and OptoMonitor product experience. All residual risks that relate to the software update to include dPR have been taken into consideration while reviewing the risks. All OptoMonitor residual risks are outweighed by potential benefits and, therefore, are acceptable.
Software verification and validation testing were conducted in accordance with IEC 62304 and documented as recommended by FDA's Guidance for Industry and FDA Staff, "Guidance for the Content of Premarket Submissions for Software Contained in Medical Devices." The software for this device was considered as a "moderate" level of concern, could lead to an erroneous diagnosis or a delay in delivery of appropriate medical care that would likely lead to Minor Injury.
No new questions of safety and effectiveness were identified during review of Risk Management documentation or execution of Verification and Validation activities.
No animal studies or clinical investigations are included with this submission.
5.9 CONCLUSIONS
The results from these tests mentioned above demonstrate that the technological and performance characteristics of the proposed OptoMonitor is comparable to the predicate device, support the safety and effectiveness of the device that is the subject of this 510(k), and ensure the subject device can perform in a manner equivalent to the predicate device with the same intended use.
The results of the verification/validation tests and the risk analysis have demonstrated that the software upgrade to allow calculation of dPR does not add any new questions of safety and is therefore
Page 3 6
6
K192340
substantially equivalent to the predicate OptoMonitor System (K142598 cleared on 06/12/2015) and reference devices, Volcano iFR Modality (K173860 cleared on 04/11/2018).
5.10 SUBSTANTIAL EQUIVALENCE
The new proposed device is the Opsens OptoMonitor including a new dPR modality. The predicate device is the currently marketed OptoMonitor (K142598 cleared on 06/12/2015) excluding the dPR modality. The OptoMonitor Optical Unit (SCU), the Handle Unit (HU) and accessories (cables, power supply, etc) are not affected by this submission. The only change is a software upgrade to the Display Unit (DU) calculating the new dPR index and an update to labeling (updated OptoMonitor Instructions for Use) to describe the additional software features. The OptoWire pressure quidewire that connects to the OptoMonitor is not affected by this submission. The reference device is the marketed Volcano s5 system (K173860), more specifically the iFR modality. The purpose of the reference device iFR modality is to demonstrate safety and effectiveness of the dPR modality.
Equivalence of Intended Use:
Indications for the device remain unchanged from the predicate device. The reference device contains similar indications for the pressure measurement modality.
Equivalence of Technological Characteristics:
The only difference between the proposed device and predicate is the addition of the dPR modality embedded into the software of the display unit. Technological Characteristics are herein identical between the proposed device and the predicate. dPR and iFR are resting indices used for the diagnostic of the severity of stenosis with the patient in resting condition, as opposed to inducing hyperemia when measuring FFR. dPR modality consists in calculating the ratio of Pd and Pa over the whole diastolic portion of the heart beat cycle while iFR calculate the same ratio over 75% of the diastole. Performance testing has confirmed equivalence of the proposed device to iFR (reference device). No new questions of safety and effectiveness were identified during review of Risk Management documentation or execution of Verification and Validation activities.
Safety and Effectiveness:
The identified questions of safety and efficacy apply to both the new device and the predicate and so the new device does not raise different questions of safety and efficacy. Specifically, a resting index calculation poses less risk to the patient as there is no need to use a hyperemic agent. The proposed device does not raise any different questions of safety and efficacy.
Conclusion
The proposed device, OptoMonitor with dPR software upgrade, was shown to be substantially equivalent to the legally marketed predicate OptoMonitor System (K142598 cleared on 06/12/2015), except for a software change that now includes a new dPR modality.
The safety and effectiveness of Opsens dPR modality has been shown to be substantially equivalent to the iFR modality of marketed device K173860 cleared on April 11, 2018.
| | | Proposed Device | Predicate Device
(Primary) | Reference Device |
|-------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Regulatory
Information | Name | OptoMonitor | OptoMonitor | Volcano s5/s5i/CORE/CORE Mobile
Precision Guided Therapy System |
| | 510(k)# | K182126 | K142598 | K173860 |
| | Predicates | K142598 | K111395
K041134 | K133323
K170133 |
| | | Proposed Device | Predicate Device
(Primary) | Reference Device |
| | Product Code | DXO | DXO, DXO | IYO |
| | Class | 2 | 2 | 2 |
| | Regulation Number | 870.2870 | 870.1330, 870.2870 | 892.1560 |
| | Regulation Generic
Name | Transducer, pressure,
catheter tip | Wire, guide, catheter;
Transducer, pressure,
catheter tip | Ultrasonic Pulsed Echo Imaging
System |
| Indications for Use | Indications for Use | To measure pressure in blood
vessels including both
coronary and peripheral
vessels, during diagnostic
angiography and/or any
interventional procedures.
Blood pressure
measurements provide
hemodynamic information,
such as fractional flow
reserve, for the diagnosis and
treatment of blood vessel
disease. | To measure pressure in blood
vessels including both
coronary and peripheral
vessels, during diagnostic
angiography and/or any
interventional procedures.
Blood pressure
measurements provide
hemodynamic information,
such as fractional flow
reserve, for the diagnosis and
treatment of blood vessel
disease. | The FFR v2.5 Modality of the
s5/s5i/Core and Core Mobile
Precision Guided Therapy System is
indicated in all blood vessels,
including coronary and peripheral
arteries, to measure intravascular
blood pressure during diagnostic
angiography and/or interventional
procedures.
The iFR Modality is intended to be
used in conjunction with currently
marketed Volcano Pressure wires. In
the coronary anatomy, the iFR
modality has a diagnostic cut-point
of 0.89 which represents ischemic
threshold and can reliably guide
revascularization decisions during
diagnostic catheterization
procedure. When used as for a
pullback assessment, the iFR
modality is intended as a visual aidAdditional, unrelated indications for use |
| | Prescription Use | Rx Only | Rx Only | Rx Only |
| Technological Characteristics | System Components | Reusable signal
processor/monitor;
Embedded software;
Connecting Cables | Reusable signal
processor/monitor;
Embedded software;
Connecting Cables.
Sterile disposable guide wire. | Reusable signal processor/monitor;
Embedded software;
Connecting Cables. |
| | System Capabilities | Measurement of
intravascular blood pressure. | Measurement of
intravascular blood pressure. | Measurement of intravascular blood
pressure.
Additional, unrelated functions |
| | Pressure Sensing &
Signal Transmission
Technology | Senses pressure from
Fiberoptic sensor. | Fiberoptic sensor & fiber
bundle embedded in
guidewire. Senses pressure
from Fiberoptic sensor. | Pressure measurement is captured
through the use of pressure wires. |
| | Connected devices | OptoWire | OptoWire | SmartWire II, PrimeWire Prestige,
PrimeWire
Prestige Plus, Verrata, Verrata Plus |
| | Auto-zeroing | Yes | Yes | Yes. |
| | Real Time Curves | Aortic instantaneous
pressure, aortic mean
pressure | Aortic instantaneous
pressure, aortic mean
pressure | Aortic instantaneous pressure, aortic
mean pressure, distal instantaneous
pressure |
| | Proposed Device | Predicate Device
(Primary) | Reference Device | |
| | pressure, distal mean
pressure | instantaneous pressure,
distal mean pressure | Heart rate | |
| Real Time Numerical
Values | Mean aortic pressure, mean
distal pressure, mean
Pd/mean Pa, dPR | Mean aortic pressure, mean
distal pressure, mean
Pd/mean Pa | Mean aortic pressure, mean distal
pressure, mean Pd/mean Pa, iFR | |
| Recording Values | Instantaneous Pa, Pd and
Pd/Pa; mean Pa; mean Pd;
mean Pd/mean Pa | Instantaneous Pa, Pd and
Pd/Pa; mean Pa; mean Pd;
mean Pd/mean Pa | Instantaneous Pa, Pd and Pd/Pa;
mean Pa; mean Pd; mean Pd/mean
Pa | |
| Hyperemic agent | Not required for dPR
Required for FFR | Required for FFR | Required for FFR. Not required for
iFR | |
| Calculation types | dPR, FFR | FFR | FFR, iFR | |
| Diastolic Resting
Indices calculations | $dPR = \frac{P_{d,diastole}}{P_{a,diastole}}$ | N/A | $iFR = \frac{P_{d,WFP}}{P_{a,WFP}}$ | |
| Resting Indices
Wave selection | Automatically selected | N/A | Automatically selected | |
| Resting indices
cutoff point | .89 | N/A | .89 | |
| Aortic Input | High Level (100 mmHg/V) | High Level (100 mmHg/V) | High Level (100 mmHg/V) | |
| Distal pressure
output | Low level 5uV/mmHg | Low level 5uV/mmHg | Low level 5uV/mmHg | |
| Hardware
components | Signal Conditioner Unit (SCU),
the Display Unit (DU), The
Handle Unit (HU) and
accessories (cables, power
supply, etc) | Signal Conditioner Unit (SCU),
the Display Unit (DU), The
Handle Unit (HU) and
accessories (cables, power
supply, etc) | The reference device is a larger
system with additional capabilities
not related to this submission. | |
| Operating Pressure | 70 to 106 kPa | 70 to 106 kPa | 70 to 106 kPa | |
| Pressure Range | -30 to 300 mmHg | -30 to 300 mmHg | -30 to 300 mmHg | |
| Pressure Accuracy | +/- 1 mmHg plus +/- 1% of
reading
(pressure range -30 to 50
mmHg) or +/- 3% of reading
(pressure range 50 to 300
mmHg) | +/- 1 mmHg plus +/- 1% of
reading
(pressure range -30 to 50
mmHg) or +/- 3% of reading
(pressure range 50 to 300
mmHg) | Not specified. | |
| Thermal Zero Shift |