Specifications:

 

1.      Method of measurement: cornea reflection light coincidence method

2.      Range of measurement: 48 to 77mm (both eyes), 24 to 38.5mm (each eye)

3.      Graduations: 0.5mm

4.      Range of focusing point: 30 to infinity

5.      Power supply: 4.5V DC (Lr03 batteries X3)