Features 1、Accurate testing, high accuracy optical power meter, accurate measurement data. 2、Sturdy and durable, made of ABS material, anti drop and durable, can be used with confidence. 3、Easy to use, optional kilometers, strong light source, 7 test wavelengths. 4、Multi purpose use, can replace different interfaces for measurement, simple and practical operation. 5、Long battery life, the battery lasts no less than 40 hours, and you can use it for a long time. Specification Item Type: Optical Power Meter Material: ABS Model: DXL 40D Battery: 1.5V 2xAA Battery (not included) Purpose: Optical fiber communication Power measurement range -70~+10dbm Probe range InGaAs Wavelength range 800-1700nm Standard wavelength (nm) 850, 980, 1300, 1310, 1490, 1550, 1625 Display resolution Linear display: 0.1% Logarithmic display: 0.01dBm Working temperature -10~+60℃ Storage temperature -25~+70℃ Automatic shutdown time (min) 10 minutes Battery continuous working time not less than 40 hours Package List 1 x Optical Power Meter(Battery Not Included) 1 x Adapter 1 x Manual