Features Wide application: this is an optical power meter designed for professionals to maintain the fibre optic network. Widely used in fiber optic engineering, fiber sensor research, optical element manufacturing, optical element research, etc. Strong functions: automatic shut-off (selection), battery volume display, absolute/relative value switchable. LCD display - LCD display with backlight, the value is easy to read. Comfortable grip - Ergonomic design, easy and fast for the user with simple button operation mode and comfortable hand feeling. Easy to carry - Compact, lightweight, universal optical interface design, easy to carry and use. Specification: Condition: 100% Brand New Model: WT65 Colour: black. Measuring range: -70dBm-+6dBm Wavelength: 850nm, 1300nm, 1310nm, 1490nm, 1550nm, 1625nm Resolution: 0.05 Accuracy: -70dBm-48dBm:+-2dBm; -48dBm6dBm,+-3.5dBm Operating environment (>-48dBm): 0-40℃ (32-104℉) 5-95%RH Operating environment: 0-32°C (32-89.6°F) 5-80%RH. Storage environment: temperature: 0-40°C (32-104°F) 5-95%RH. Power supply: 2 x 1.5V AAA batteries (not included) Automatic switch-off: 10 minutes. LCD backlight: yes. Battery volume display: yes. Absolute / relative value switchable: yes. Weight: approx. 83 g / 2.9 oz. Size: approx. 120 x 33 x 18/4.7 x 1.3 x 0.7 inches. Package list: 1 x network cable tester. Package List