Function: In consideration of ergonomics, this mini optical power meter with its compact, portable and easy operating features is specially designed for pros who amount, maintain the fiber optic network. This unit is widely applied with its 6 wave length selection. Application fields: 1.Optic fiber engineering; 2.Optic fiber sensor research; 3.Optic elements production; 4.Optic elements research; 5.Other optic fiber engineering; 6 optic wave length for selection --- 850nm / 1300nm / 1310nm / 1490nm / 1550nm / 1625nm; Universal optic interface design; Reading unit switching between absolute power and relative power; Battery volume display; Auto power off (optional); Light, mini size and low power consumption; specification Product name optical power meter measuring range -70dBm-+6dBm Wave length 850nm,1300nm,1310nm,1490nm,1550nm,1625nm Resolution 0.05 Accuacy -48dBm,±2dBm,-48dBm,±3.5dBm Operation enviroment-48dBm temperature:0-40?(32?-104?) Humidity:5-95% Operation enviroment-48dBm temperature:0-32?(32?-89.6?)Humidity:5-80% storage environment temperature:0-40?(32?-104?) Humidity:5-95% auto power off time 10minutes power 1.5V AAA*2(included in package)