Features Measuring Range --- The fiber optic power meter has a measurement range of ‑50‑26dbm and a wavelength range of 800‑1700nm, widely used for engineering maintenance. 2 Backlight Modes --- The default smart mode when turning on, with no operation for 3 minutes, automatically turns off the backlight, press the LED key to switch to smart mode. Frequency Identification --- Accurate identification of optical fiber transmission frequency, can be used to judge light emitting mode, whether continuous or intermittent light. Automatic Shutdown --- The automatic shutdown function is enabled by default, will automatically shut down after 10 minutes of no operation, adding wavelength memory function. Units Switching --- Press the UNIT key to select dBm, dB, and uW switching units in turn, and the test data will be displayed with the corresponding results. Specification: Item Type: Optical Power Meter Wavelength Range: 800-1700nm Probe Type: For 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 Frequency Identification: 0Hz, 270Hz, 1000Hz, 2000Hz Offline Saved Data Number: 40PCS Input Voltage: 3-6V Working Temperature: -10-60℃ Storage Temperature: -25-70℃ Automatic Shutdown Time: 10 Minutes Battery Continuous Working Time: ≥48h Battery Type: 2 x AAA Battery (not included) Package List:1 x Optical Power Meter 1 x User Manual Note:Battery Not Included Package List 1 x Optical Power Meter 1 x User Manual