Optical Fiber Power Meter Red Light Source Network Optic Tester with LED Light Communication Engineering AUA‑D70 ‑70dBm to +10dBm 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.