Product Description HA-2 is a compact and light-weight tonometer. It is easy-to-use and well-balanced. Its unique -spting mechanism enables correct reading irrespective of the patient's posture. The built-in illumination allows you to use it regardless of the illuminating condition of consultation room. Its direct reading type precision dial requires no conversion table to change the readings. Additionally, accessories like adjustable head rest and interchangeable eyepiece provide most suitable conditions for measurement.Features- Compact, light-weight and well balanced- Easy to handle with one hand- Battery operated- Unique one-spring design- Optional 3x long eye-relief for presbyopic users- Built-in illumination- Direct reading type precision dial- Adjustable head rest- Interchangeable eyepiece- Warranty: Two years parts & laborSpecifications:- Applanation Prism Doubling prism (option)- Scale Range 0 ~ 60mm Hg (1mmHg division)- Illumination:    - ON / OFF    - Bulb    - Battery used Interlock with thumb wheel- Illumination Bulb 2.5V, 0.25A , 2 pcs- Eyepiece Magnification 6x, 3x (Optional)- Head Rest Movable- Length 290 mm- Weight 240g with AAA Batteries Package includes:- Carrying Case- Calibration Weights- Spare Bulb- 10x Eyepiece- Prism Warranty Information 1 Year Warranty