Feature:1. Accurate measurement, high measurement accuracy and backlit LCD display resolution, with user selfcalibration function.2. Quick response and measurement. When the output power changes, it can display fast tracking and realtime measurement of optical power.3. Wide measurement range, can provide 80dB optical power measurement range, absolute optical power measurement and relative power measurement.4. Six calibration wavelengths: 850nm, 1300nm, 1310nm, 1490nm, 1550nm and 1625nm.5. Easy to use, realtime monitoring and display of battery power When the battery power is low, a warning notification will be displayed and automatic shutdown function.6. The portable optical fiber tester requires 3xAAA batteries(Not Included), has a long battery life, is convenient to carry and use, and is very convenient.Specification:Item Type: Optical TesterMaterial: PlasticProduct Model: TL510Measurement Range dBm: -70~+10 dBm (the actual best measurement range is -65 ~ 0dBm)Wavelength Range (nm): 800-1650Calibration Wavelength: 850nm, 1300nm, 1310nm, 1490nm, 1550nm, 1625nmDetector: InGaAsAccuracy: <3% (-10dBm. 22)Resolution: Linearity: 0.1%, Non-linearity: 0.01dBmWorking Temperature: -10-+50Storage Temperature: -20~+70Relative Humidity: 90% (+ 30C)Connector: Removable for FC / PC SC / PCPower Supply: 3xAAA batteries (delivered without batteries)Working Time:> 120 hours (without backlight).Package List:1 x Optical Power Meter(Battery Not Included)1 x Adapter Head1 x Storage Bag1 x Manual