Designed to measure the power of an optical signal. Its portable and has easy operating features, designed for who totally maintain the fiber optic network. This unit is widely applied with its 6 wave length selections. The measurement is a real-time measurement. It is a continuous test and any changes will be recorded. Applications: optic fiber engineering and sensor research, optic elements production and research and other fiber optic engineering. Color: dark gray Material: ABS + electronic components Features: 6 Optic wave length selection --- 850nm / 1300nm / 1310nm / 1490nm / 1550nm / 1625nm Switch between Absolute power and Relative Power readings Compact design, , easy to carry, operate and low power consumption Large LCD display screen shows the testing results, easy to read Ergonomic with universal optic interface design FC converter for FC/SC/ST interface With auto power off (optional) and battery indicator Measuring range: -70 ~ 6dBm Wave Length: 850nm, 1300nm, 1310nm, 1490nm, 1550nm, 1625nm Resolution: 0.05 Accuracy: or equal -48dBm, 2dBm Less than or equal -48dBm, 3.5dBm Units: dBm, dB Operation enviroment : or equal -48dBm Temperature: 0~40C (32~104F) Humidity: 5~95% Operation enviroment : Less than or equal 48dBm Temperature: 0~32C (32~89.6F) Humidity: 5~80% Storage environment Temperature: 0~40C (32~104F) Humidity: 5~95% Auto power off (10minutes idle) Power: 2 x 1.5V AAA Battery Weight: 59.22g (including battery) Package Contents: 1 x Optical Power Meter 2 x 1.5V AAA Battery 1 x English User Manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.