★High hardness Synthetic CZ test prism.
★Scale range:1.35-1.85.Accuracy: ≦±0.003
★Professional optical design, Clear Shadow edge,Aluminum alloy table and Internally installed the monochromatic light(wavelength:589.5nm)
★There are two ways of inputing the voltage:2xAAA batteries and DC3V 50mA direct current suply(AC100—240V).
★Equipped with a polarizer and 2ml refractive index liquid(1.78±0.005) with glass bottle.
★Eyepiece: 32mm in diameter, with magnifying function; Test conditions: Temperature: room temperature 5-35°C, humidity: ≤75%, no acid, alkali and other corrosive gases in the room;