Features Excellent ABS Material: This optical power meter is made of excellent ABS material, which is sturdy and wear resistant, and to a certain extent reduces collision and accidental fall damage to the machine. Multifunctional: This optical power meter is multifunctional, it supports illumination, auto shutdown, backlight selection, wavelength memory function, and user calibration. LED Lighting Flashlight: This optical power meter with LED lighting flashlight, the high brightness LED flashlight function is easy to deal with dim environment efficient construction. High Accuracy: This optical power meter has high measurement accuracy with a measurement range of ‑50 to +26dBm, ensuring stable and accurate measurement results. Compact And Portable: This optical power meter is small in size and light in weight, which is very convenient to carry and use on the go. Specification: Item Type: Optical Power Meter Model: G9 Y50 Material: ABS Wavelength Range: 800-1700 Detector Type: InGaAS Power Measurement Range: -50-+26 Tolerance: ±5% Standard Wavelength: 850nm, 980nm, 1300nm, 1310nm, 1490nm, 1550nm, 1625nm Display Resolution: Linear Display: 0.1%, Logarithmic Display: 0.01dBm Red Light Operating Wavelength: 650nm Frequency Recognition: 270HZ, 1000HZ, 2000HZ Saved Data Quantity: 20PCS Operating Temperature: -10-+60℃ Storage Temperature: -25-+70℃ Auto Off Time: 10min Power Supply Battery:1 Lithium Ion Battery 1500mAh ( Built In Carrying )  Charging Voltage: DC 5V Package List: 1 x Power Meter 1 x Charging Cable 1 x Manual Package List 1 x Power Meter 1 x Charging Cable 1 x Manual