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Tonometer Schiotz YZ7A model INS-11012. Is easy to use to measure the intraocular pressure. Each increment on the scale equals to 1/20mm corneal depth, and the readings on scale can be converted to intraocular pressure by looking up the calibration scale for tonometer.

Dimensions: 7 x 4 x 1 in / 18 x 10 x 2 cm Weight: 10.40 oz / 295