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The TonoPach Ultrasonic Tonometer/Pachymeter Model P-201 is a diagnostic instrument that is intended for use in the measurement of both intraocular pressure and corneal thickness. It is intended for use during or following surgery and as a screening, monitoring or diagnostic aid in patients with normal, disease-induced or surgically altered anatomy, or in glaucoma suspects under current therapeutic guidelines.

The TonoPach is a portable, battery operated, handheld ophthalmic instrument which measures both intraocular pressure (IOP) and corneal thickness (CT) simultaneously and at the same locus on the cornea. The device uses the principles of applanation pneumatometery to measure IOP and the principles of reflection pulsed ultrasound pachymetry to measure CT. The system is comprised of the TonoPach electronics, transducer handpiece, protective membranes and optionally, a foot pedal.