Feature: 1. 3 IN 1 FUNCTION: With optical power meter, LED lamp and red light tester functions, the detection distance of red light source is 10km. 2. GOOD PERFORMANCE: The meter has sensitive chip and solid internal structure, low battery consumption, 40 hours of continuous operation. 3. 10 WAVELENGTHS: Supports 850nm, 980nm, 1270nm, 1300nm, 1310nm, 1490nm, 1550nm, 1577nm, 1625nm and 1650nm wavelengths. 4. APPLICABLE ADAPTER: The power meter is compatible with the SC FC ST adapter, meeting most requirements of comm engineering maintenance. 5. EASY OPERATION: The optical tester has a compact size, with clear display screen, button operation, which is convenient and practical. Specification: Item Type: Optical Power Meter Material: ABS Red Light Source Detection Distance: 10km Power Supply: 2 x AAA Battery (not included) Wavelength Range: 850-1650nm Standard Wavelength: 850nm, 980nm, 1270nm, 1300nm, 1310nm, 1490nm, 1550nm, 1577nm, 1625nm, 1650nmDisplay Resolution: Linear Display: 0.1% Logarithmic Display: 0.01dBm Working Temperature: -10-60℃ Storage Temperature: -25-70℃ Automatic Shutdown Time: 10 Minutes Battery Continuous Working Time: Not less than 40 hours. Package List: 1 x Optical Power Meter1 x Hanging Rope1 x User Manual