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:850/980/1300/1310/1490/1550/1625 Display resolution: tineardisplay 0.1, Logarithmic display:0.0ldBm working temperature(C):-10-+60 Storage temperature(C):-25-+70 Automatic shutdown time(min): Notless than 40 hours Output of Visual Fault Locatorpen:650nm Material:ABS colour:blue Package Contents: 1 x Optical Meter Only 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.