Welcome to the store! 1、2 Backlight Modes: Default smart mode after startup, backlight automatically turns off without operation for 3 minutes. In the off state, press the LED button to switch to smart mode. 2、Wavelength Memory: The wavelength test range of this optical power meter is 800‑1700nm, with an added wavelength memory function to remember the test wavelength set before shutdown. 3、Frequency Identification: Can accurately identify the transmission frequency of optical fiber, which is used to determine the lighting mode and whether it is continuous or intermittent during technical construction. 4、Other Functions: Supports FC, SC, ST common fiber interfaces, detachable metal pen tip for easy replacement of ceramic core, and automatically shuts down after 10 minutes of inactivity. 5、Unit Switching: Press the UNIT button to select the units dBm, dB, and uW in sequence, and test data will be displayed in corresponding results, which is convenient and practical. Item Type: Optical Power Meter Wavelength Range: 800-1700nm Probe Type: For InGaAs Measurement Range: -70-6dbm Uncertainty: ±5% Standard Wavelength: 850nm, 980nm, 1270nm, 1300nm, 1310nm, 1490nm, 1550nm, 1577nm, 1625nm Display Resolution: Linear display: 0.1%, Logarithmic display: 0.01dBm Red Light Working Wavelength: 650nm Output Distance: 5km Frequency Identification: 0Hz, 270Hz, 1000Hz, 2000Hz Offline Saved Data Numbers: 40PCS Input Voltage: 3-6V Working Temperature: -10-60℃ Storage Temperature: -25-70℃ Automatic Shutdown Time: 10min Battery Continuous Working Time: ≥48h Battery Type: 2 x AAA Battery (Not Included) 1 x Optical Power Meter 1 x User Manual Your satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will give you the best solution!