1、TWO BACKLIGHT MODES: Optical multi meter start in intelligent mode by default, and automatically turn off the backlight after 3 minutes without any operation. In Off mode, press the LED key to switch to smart mode 2、WAVELENGTH MEMORY FUNCTION: Optical power meter add memory function to remember the test wavelength set before power off after power off 3、OPTICAL FIBER TRANSMISSION FREQUENCY IDENTIFICATION: The power meter can accurately identify the optical fiber transmission frequency, which can be used to determine the luminous mode in the engineering construction process, whether the continuous intermittent light 4、INTELLIGENT STANDBY MODE: By default, the optical fiber power meter enables the automatic shutdown function when powered on. Automatically shut down after 10 minutes without any operation, saving power 5、TWO KINDS OF DATA UNITS DISPLAYED: Press the (UNIT) key of fiber optic cable tester to select dBm, dB and uW units in turn, and the test data will be displayed with corresponding results Item Type: Optical Multi Meter Wavelength Range: 800 - 1700nm Detector Type: For InGaAs Measuring Range (dBm): -70~+6 Uncertainty: ±5% Standard Wavelength (nm): 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625 Display Resolution: Linear Display: 0.1%, Logarithmic Display: 0.01dBm Red Light Working Wavelength (nm): 650 Frequency Identification (Hz): 0, 270, 1000, 2000 Number of Data Saved Offline (pcs): 40 Input Voltage (V): 3~6 Operating Temperature (℃): -10~+60 Storage Temperature (℃): -25~+70 Automatic Shutdown Time (min): 10 Battery Duration (h): ≥48 Battery (mAh): 2 x AAA battery(not included) 1 x Optical Multi Meter 1 x User Manual