Powerful light source, Fall resistant and durable. High precision optical .Different interfaces can be replaced, The operation is simple and practical.Reduce the damage of falling to the machine.At the same time, press the +LIGHT key to enter the school.Quasi-mode, the screen letter "dBm"is not displayed Press ZERO to save and exit calibration mode The screen letter "dBm"is redisplayed measurement range:-70-+10dBm Detector type: InGaAs Wavelength range:800-1700nm Standard wavelength nm:850/980/1300/1310/1490/1550/1625Display resolution: tineardisplay 0.1, Logarithmic display:0.0ldBm working temperature(C):-10-+60Storage temperature(C):-25-+70Automatic shutdown time(min): Notless than 40 hoursOutput of Visual Fault Locatorpen:650nmMaterial:ABScolour:bluePackage Contents:1 x Optical MeterOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.