3 in 1 Fiber Optic Tester -50 To +26dBm Optical Power Meter 30mW 30km Visual Fault Locator OPM and VFL with LED Light Item Type: Fiber Optic Tester Material: ABS Model: A C510B Power Testing Range: -50 to +26 dBm Probe Type: InGaAs Wavelength Range: 850 to 1650nm Testing Accuracy: ±0.2dB Standard Wavelength (nm): 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650 Display Resolution: Linear Display: 0.1%, Logarithmic Display: 0.01dBm Operating Temperature (℃): -10 to +60℃ Storage Temperature (℃): -25 to +70℃ Auto Shut Off Time: 10 Minutes Red Light Source Testing Distance: 30mW Output Wavelength: 650nm Size: Approx. 180x89x42mm / 7.09x3.5x1.65in Power: 1 x 3.7V Rechargeable Lithium Cell, Capacity: 650mAh (Built in)