Optical Ophthalmic Digital PD Meter Pupilometer Test Ruler By Gadgetworkz
Features:    Easily opeation, fast measuring and displaying    Can seperately measuring left or right eye    automatical off    automatical memory    Battery Voltage: 23A, 12V     Power: 5W    Shipping weight: 1 lbs    Box Size: 21.5(L)x12.2(W)x44(H)cm