Handheld Tonometer Kowa HA-2 This lightweight and versatile hand-held Tonometer is accurate and affordable. It comes in a small carrying case making it the perfect partner for your domiciliary visits where you need the reliability of a Goldmann type applanation system. Product Highlights Specifications Type Hand-held applanation tonometer Applanation Prism Doubling prism (option) Scale Range 0 ~ 60mm Hg (1mmHg division) Illumination a) ON / OFF b) Bulb c) Battery used Interlock with thumb wheel Lens Bulb 2.5V, 0.25A 1.5V, 2 pcs Eyepiece Magnification 6x Head Rest Movable Length 290 mm Weight 240 g with AAA Batteries Rechargeable Battery Welch Allyn ** Battery 72200 (3.5v) Features Type: Applanation Measurment Range: 0 to 60 mm Hg Alignment: Manual Portability/Weight: handheld/battery operated 0.53 lbs. Options: Optional 3x long eye relief for presbyopic users Additional Features:Handheld and battery operated (2 AA batteries) Built-in illuminationpermits use regardless of room light. Direct reading of dial requireson conversion table. Adjustable built in head rest steadies thetonometer during measurements.