Feature: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 mode2. WAVELENGTH MEMORY FUNCTION: Optical power meter add memory function to remember the test wavelength set before power off after power off3. 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 light4. 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 power5. 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 resultsSpecification:Item Type: Optical Multi MeterWavelength Range: 800 - 1700nmDetector Type: For InGaAsMeasuring Range (dBm): -70~+6Uncertainty: 5%Standard Wavelength (nm): 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625Display Resolution: Linear Display: 0.1%, Logarithmic Display: 0.01dBmRed Light Working Wavelength (nm): 650Frequency Identification (Hz): 0, 270, 1000, 2000Number of Data Saved Offline (pcs): 40Input Voltage (V): 3~6Operating Temperature (): -10~+60Storage Temperature (): -25~+70Automatic Shutdown Time (min): 10Battery Duration (h): 48Battery (mAh): 2 x AAA battery(not included).Package List:1 x Optical Multi Meter1 x User Manual