1. Use high-quality materials, 2.9 measuring wavelengths, with 5G measuring wavelength added 3. Built in polymer lithium battery, which can be used for 20 hours at a full charge. When the power is low, it supports plug and play 4. Light weight, small volume and convenient carrying; Ergonomically designed soft glue material, more comfortable to hold 5. LED flashlight lighting function, convenient for line checking construction in dark environment Wide range of use Optical Power Meter Optical Fiber Tester Charging 5G Special Optical Power Meter -70 to 10dbm Built-in Battery Optical Power Meter Standard wavelength: 850/980/1270/1300/1310/1490/1550/1577/1625nm Measurement range: -70 to 10dbm Detector type: InGaas Display resolution: linear display: 0.1% logarithmic display: 0.01dBm Frequency identification: 270Hz, 1000Hz, 2000Hz Endurance time: ≥ 20H Charging voltage/current: 5V/500mA Automatic shutdown time: 10min Lithium battery capacity: 400mAh Frequency band: A -70-+10dBm Color: As Shown Material: ABS Package Contents: 1set * handheld optical power meter tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.