1、QUICK AND ACCURATE: Equipped with sensitive chip, this optical power meter can measure accurately and quickly, without any preheating time, simply plug and play. 2、MULTI FEATURES: The fiber optic power tester features relative power calculation, calibration function, automatic shutdown function and more, bringing great convenience. 3、WIDE WAVELENGTH RANGE: With a wavelength range of 850 to 1650nm, this optical power tester covers most requirements of communication engineering maintenance. 4、20KM RED LIGHT SOURCE: The optical power meter has a fiber fault point detection function, the red light source detection distance is up to 20km, suitable for most applications. 5、RJ45 NETWORK TEST: This device also has a RJ45 network testing function, allowing you to quickly check and correct network cable wiring. Item Type: Optical Power Meter Material: ABS Red Light Source Detection Distance: 20km Power Supply: 3.7V lithium battery x 1, capacity 650mAh (built in) Probe Range: InGaAs Wavelength Range: 850-1650nm Standard Wavelengths (nm): 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650 Display Resolution: Linear display: 0.1%, logarithmic display: 0.01dBm Working Temperature: -10℃ to +60℃ Storage Temperature: -25℃ to +70℃ Automatic Shutdown Time: 10 minutes Battery Continuous Working Time: Not less than 40 hours 1 x Optical Power Meter 1 x User Manual 1 x USB Cable 1 x Lanyard