Features 1、4 IN 1 PURPOSE: Multi functional optical fiber tester, with optical power meter, network cable tester, red light tester and LED light functions, convenient and practical. 2、10 WAVELENGTH: For 850nm, 980nm, 1270nm, 1300nm, 1310nm, 1490nm, 1550nm, 1577nm, 1625nm, 1650nm wavelengths, support SC FC ST adapter. 3、MULTIPLE FUNCTION: The tester has relative power calculation and calibration function, with accurate measurement, and less interference. 4、GOOD PERFORMANCE: Adopting sensitive chip and sturdy internal structure, covering most of the maintenance needs of comm engineering. 5、BUILT IN BATTERY: The meter has built in 650mah lithium battery, equipped with USB cable, with low consumption, can work continuously for 40 hours. Specification Item Type: Optical Power Meter Material: ABS Red Light Detection Distance: 1km Power Supply: 1 x 650mah 3.7V lithium battery (built in battery) Wavelength Range: 850-1650nm Standard Wavelengths: 850nm, 980nm, 1270nm, 1300nm, 1310nm, 1490nm, 1550nm, 1577nm, 1625nm, 1650nm Display 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 Meter 1 x User Manual 1 x USB Cable 1 x Hanging Rope