Function: 1. Accurate measurement, high measurement accuracy and resolution of the illuminated LCD display, with user auto-calibration function. 2. Quick response and measurement. When the output power changes, it can display fast tracking and real-time optical power measurement. 3. Wide measuring 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 real-time monitoring and display of battery status When the battery level is low, a warning notification and automatic shutdown function will be displayed. 6. Specification: Item Type: Tester Optical Material: plastic Product Model: TL510 dBm measuring range: -70 10 dBm (actual best measuring range is -65 0 dBm) Wavelength Range (nm): 800-1650 Wavelength Calibration: 850nm, 1300nm, 1310nm, 1490nm, 1550nm, 1625nm Detector: InGaAs Accuracy: resolution: linearity: 0,1%, nonlinearity: 0,01 dBm Operating temperature: -10 - 50 Storage temperature: -20 70 Relative humidity: 90% ( 30C) Connector: interchangeable for FC/PC SC/PC Power Supply: 3xAAA batteries (supplied without batteries) Working time:> 120 hours (without backlight) How to use: 1. Press the power button and the “dBm” button at the same time and the instrument will enter manual calibration mode (all 4 rows of units are displayed at this point) 2. Select the calibration wavelength with “λ”, press “REF” to increase by 0,05 dB each time, and “dB/W” to reduce the power value by 0,05 dB 3. Briefly press the power button to save calibration data 4. Press the power button and the “REF” button at the same time to exit the calibration mode. List of packages: 1 x Optical Power Meter (Battery Not Included) 1 x Adapter Head 1 x do storage bag 1 x Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-dadangjia