Easy to operate and replace battery

Technicel parametars:
Method of measurement:cornea refiction light coidence method
Rang of measurement: 44 to 83mm (both eyes), 22 to 41.5mm (each eye):
Range of focusing point:30 to infinity
Precision: 0.5 mm;
Power supply: 6V DC
WEIGHT: 0.8 Kg;
Dimensions: 310 mm X 230mm X 110 mm.