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% New Model:WT65 Color:Black Measuring 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%RH Storage Environment: temperature:0-40(32-104) 5-95%RH Power Supply: 2 x 1.5V AAA Batteries(not included) Auto Power Off: 10min LCD Backlight: Yes Battery Volume Display: Yes Absolute/Relative Value Switchable:Yes Weight: Approx. 83g / 2.9oz Size: Approx. 120 * 33 * 18 / 4.7 * 1.3 * 0.7in Package List: 1 * Network Cable Tester