Features 1、2 Backlight Modes: Default smart mode after startup, the backlight will be automatically turned off without operation for 3 minutes. In the off mode, press the LED key to switch to smart mode. 2、Wavelength Memory: The wavelength testing range of this optical power meter is 800‑1700nm, with an added wavelength memory function to remember the test wavelength set before shutting down. 3、Frequency Identification: Can accurately identify the transmission frequency of optical fiber, used to determine the lighting mode and whether it is continuous or intermittent during engineering 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 no operation. 5、Units Switching: Press the UNIT key to select dBm, dB, and uW units in turn, and the test data will be displayed in the corresponding results, which is convenient and practical. Specification 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 Number: 40PCS 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) Package List 1 x Optical Power Meter 1 x User Manual