illumination form:big spot,small spot,red free,central net,slit,half spot ;
diopter compensation :0 ±1 ±2 ±3 ± 4 ±5 ±6 ±8 ±10 ±15 ±20 ±25 +40(D)
size of the aural:2.5、3、4、5mm
magnifler :2 times ;
illumnation bulb3.5V/0.7A
power supply:AC220V(50HZ)
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