Feature: 1. Power Saving Design: With two backlight modes, default smart mode when turned on, no operation for 3 minutes to automatically turn off the backlight. In off mode, press the LED key to switch to intelligent mode. 2. Wavelength Memory Function: Comes with memory function to remember the test wavelength set before shutdown. 3. High Accuracy: Accurately identify the fiber optic transmission frequency, which can be used to determine the lighting mode and whether it continuously emits light during engineering construction. 4. Intelligent Standby Mode: The automatic shutdown function is enabled by default when turning on, and it will automatically shut down after 10 minutes without any operation. 5. Multiple Units: Press the UNIT key to select dBm, dB, and uW units in sequence. The test data will be displayed with the corresponding results. Specification: Item Type: Optical Fiber Power Meter Wavelength Range: 800-1700nm Probe Type: InGaAs Measurement Range: -70~+6dbm Uncertainty: ± 5% Standard wavelengths: 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 Number of Offline Saved Data: 40Pcs Input Voltage: 3-6V Working Temperature: -10~+60 ℃ Storage Temperature: -25~+70 ℃ Automatic Shutdown Time: 10min Battery Continuous Working Time: ≥ 48h Battery Type: 1 x 3.7V rechargeable lithium battery, 600mAh. Shipped with built in battery. . Package List: 1 x Optical Fiber Power Meter1 x User Manual