Features:All the lenses are multi-coated moisture proof and anti-reflection All the adaptors are universal Specification :Type: parallelEyepiece: 12.5XTotal magnification and field of view(mm): 6X (33), 10X (22.5), 16X (14), 25X (8.8), 40X (5.5)Range of PD (mm): 55-75Diopter adjustment: -5D +3DSlit height: 1mm8mm continuously adjustableSlit width: 0mm9mm continuously adjustableLight spot diameter: 9, 8, 5, 3, 2, 1, 0.2mmSlit angle: 0180 degreeSlit inclination: 5, 10 , 15, 10, 20 degreeFilter: heat absorption, grey, red free, cobalt blueIllumination bulb: 12V30W halogen bulbInput voltage: 110V/220V +/- 10% 60/50Hz +/- 1HzInput power: 58VAElectrical safety standard: IEC 601-l, Class 1, Type B