Features:1. This is an optic power meter designed for professionals to maintain the fiber optic network.2. Compact, lightweight, universal optic interface design,easy to carry and operate.3. LCD display with backlight, it is easy to read value.4. More advantage:auto power off(selection),battery volume display, absolute/relative value switchable.5. Ergonomic design, easy and fast for user to use with simple key operation mode and comfortable hand feeling.6. Widely used in optic fiber engineering,optic fiber sensor research,optic elements production,optic elements research etc.Specification:Condition: 100% NewModel:WT65Color:BlackMeasuring range: -70dBm-+6dBm.Wave length: 850nm,1300nm,1310nm,1490nm,1550nm,1625nm.Resolution: 0.05.Accuracy: -48dBm:+-2dBm; -48dBm6dBm,+-3.5dBm.Operation Environment(>-48dBm): 0-40(32-104) 5-95%RH.Operation Environment(:0-32(32-89.6) 5-80%RHStorage Environment: temperature:0-40(32-104) 5-95%RHPower Supply: 2 x 1.5V AAA Batteries(not included)Auto Power Off: 10minLCD Backlight: YesBattery Volume Display: YesAbsolute/Relative Value Switchable:YesWeight: Approx. 83g / 2.9ozSize: Approx. 120 * 33 * 18 / 4.7 * 1.3 * 0.7inPackage List:1 * Network Cable Tester.