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The device measures the body temperature of a patient by means of a sensor (transducer) coupled with electronic signal amplification, conditioning and digital LCD (display) unit. The device is reusable and intended for oral, axillary or rectal temperature measurements.

The shaker digital thermometer, model ST8S Series, are the electronic thermometers by using a thermistor as the temperature sensor. The signal of sensor is calculated and displayed by an ASIC (Application Specific IC) - controlled circuit, which is considered the hard-wire control instead of programmable control. From the construction point of view, the digital thermometer comprises of a thermistor for measuring sensor, a reference resistor for comparison of temperature, a buzzer for sounding effect, an ASIC for calculating, and LCD for displaying the measuring temperature digitally for which the thermistor contacts. ST8S uses a hand shaking power generation mechanism to generate the electrical power required for short time temperature measurement operation. Whenever the generated power is low, the device as well as LCD display are switched off automatically. Regarding the performance of ST8S Series, it was designed and verified according to the US standard ASTM E 1112-00.