Features [CLEAR DISPLAY] The clear screen display of the power meter allows you to read clearly, and these details can greatly improve your experience. [SENSITIVE CHIP] The sensitive chip inside the power meter makes the display result accurate and can perfectly test the connection loss. [10 WAVELENGTHS] Can measure 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650nm wavelength light source, covering most of the needs of communications engineering maintenance. [LONG BATTERY LIFE] The optical power meter has a long standby time, and the battery (excluded) can be used for at least 120 hours, which is convenient for your use. [HIGH ACCURACY] No waiting for warm up, this optical power meter is plug and play for accurate measurements, with relative power calculation and calibration. Specification: Item Type: Multifunctional Optical Power Meter Material: ABS Wavelength Range: 800-1700nm Optical Connector: Universal connector (SC/FC/ST) Connector Type: InGaAs Measurement Accuracy Error: Measured Standard Wavelength: 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650nm Display Resolution: Linear display 0.1%, logarithmic display 0.01dBm Identifiable Frequency: 270Hz, 300Hz, 1kHz, 2kHz Power Supply: 2 x AAA batteries (shipped without batteries) Battery Duration: Greater than or equal to 120h (optical power meter function) Automatic Power Off Time: 10 minutes Color: White Package List: 1 x Multifunctional Optical Power Meter 1 x Lanyard 1 x Instruction Package List 1 x Multifunctional Optical Power Meter 1 x Lanyard 1 x Instruction