Optical Fiber Power Meter Portable 4 in 1 Digital Rechargeable ‑70‑+10dBm Fiber Tester for Communication Engineering Item Type: Optical Fiber Power Meter Material: ABS Wavelength Range: 800-1700nm Optical Connector: Universal connector (SC/FC/ST) Connector Type: InGaAs Power Measurement Range: -70-+10dBm Measurement Accuracy Error: <±5% Standard Wavelength: 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650nm Display Resolution: Linear display 0.1%, logarithmic display 0.1dBm Identifiable Frequency: 270Hz, 300Hz, 1kHz, 2kHz Power Supply: Lithium battery 3.7V capacity 700mah (built in) Interface: Micro USB Battery Duration: Greater than or equal to 120 hours (optical power meter function) Automatic Power Off Time: 10min Red Source Function: Working Wavelength: 650nm±30nm Working Mode: CW, 1Hz, 2Hz