Optical Power Meter 30km VFL Visual Fault Locator -70-10dbm Portable Fiber Optic Tester with LED Lamp Lighting Item Type: Fiber Optic Tester Product Material: ABS Power Testing Range: -70-+10dbm Probe Type: For InGaAs Wavelength Range: 850-1650nm 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 Working Temperature: -10-60℃ Storage Temperature: -25-70℃ Auto Power Off Time: 10 minutes Red Light Source Testing Distance: 30mW Output Wavelength: 650nm Product Size: Approx. 180 x 89 x 42mm / 7.1 x 3.5 x 1.7in Battery: 1 x 3.7V Rechargeable Battery 650mAh (Built in)