Specifications:Color:purple + graySize:19*9*4.5cmBattery:2x AAEquipment Type:fiber optic toolsPower Measurement Range:-70~+10dbmProbe Type:InGaAsWavelength Range:800~1700nmStandard Wavelength:850/980/1300/1310/1490/1550/1625nmOperating Temperature:-10~+60℃Storage Temperature:-25~+70℃Automatic Shutdown Time:10 minutes Features:-User self-calibration function.-Can measure 850/980/1300/1310/1490/1550 / 1625nm 7 wavelengths of light absolute power value. Test range: 70dBm ~ +10 dBm.-Using AA batteries, up to 40 hours of continuous working hours.-Linear (mW) and non-linearity (dBm) are displayed on the same screen.-Unique FC / SC / ST common interface, the conversion is simple and convenient.-Optional automatic shutdown function.-Optional on / off backlight display. Note:-Wavelength range: Specifies a standard operating wavelength λ range from λmin to λ max, in which the optical power meter designed in the wavelength range can operate under specified specifications.-Power measurement range: can be measured according to the specified indicators of the maximum optical power range.-Uncertainty: The error between the test results for a certain optical power and the standard optical power test results. Package Included:1x optical power meter [Batteries are not in included.]1x manual