Features 1、2 Backlight Modes: This light meter has 2 backlight modes. The default mode is smart mode when powering on, and the backlight will turn off automatically after 3 minutes without any operation. In off mode, press the LED key to switch to smart mode. 2、Wavelength Memory Function: This light power meter has a wavelength memory function, which can remember the test wavelength set before power off after power off. 3、Identify Fiber Optic Transmission Frequency: This light power meter can accurately identify the fiber optic transmission frequency, which can be used to determine the light emitting mode during the construction process, whether the light is continuously intermittent or not. 4、Two Data Units Display: This optical power meter has two data units display, you can press the UNIT key to select dBm, dB, uW unit in turn, the test data will be displayed with the corresponding results. 5、Multiple Interface Supported: This optical power meter supports multiple interfaces, such as FC, SC, ST common interfaces. Specification Item Type: Fiber Optic Cable Tester Material: ABS Wavelength Range: 800-1700nm Probe Type: InGaAs Measurement Range: -50-+26dbm 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 Recognition: 0Hz, 270Hz, 1000Hz, 2000Hz Number of Data Saved Offline: 40PCS Operating Temperature: -10-+60℃ Storage Temperature: -25-+70℃ Auto Power Off Time: 10min Battery Operating Time: ≥48h Battery Type: AAA Battery x 2 ( Shipped Without Battery ) Package List 1 x VFL Fiber Optic Power Meter 1 x Manual