Features Better Testing: The optic fiber power meter has a wide testing range, which suits perfectly for SC, FC and ST adapters. Reliable Using: Comes with calibration and relative power calculation function, the digital optic cable is easy to use. The Wavelength: 10 kinds of wavelength, 850nm, 980nm, 1270nm, 1300nm, 1310nm, 1490nm, 1550nm, 1577nm, 1625nm, 1650 nm. Simple Working: Thanks to the sensitive chip and sturdy internal structure, the optic tester is quick in response. Easy Carrying: Designed to have a compact size and a light weight as well, very easy to carry for indoor and outdoor. Specification: Item Type: Optical Fiber Power Meter Material: ABS Red Light Source Detection Distance: Approx. 1000m / 3280.84ft Power Supply: 2 x AAA battery, shipped without battery.  Probe Range: InGaAs Wavelength Range: 850-1650nm Standard Wavelengths: 850nm, 980nm, 1270nm, 1300nm, 1310nm, 1490nm, 1550nm, 1577nm, 1625nm, 1650nm.  Linear Display Resolution: 0.1% Logarithmic Display Resolution: 0.01dBm Working Temperature Resolution: -10 ~ +60℃ Storage Temperature Resolution: -25 ~ +70 ℃ Automatic Shutdown Time: 10 Minutes Battery Powered Continuous Working Time: Not less than 40 hours.  Package List: 1 x Optical Fiber Power Meter 1 x Lanyard 1 x User Manual Package List 1 x Optical Fiber Power Meter 1 x Lanyard 1 x User Manual