Designed to measure the power of an optical signal for professionals 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. Features: 6 Optic wave length selection --- 850nm / 1300nm / 1310nm / 1490nm / 1550nm / 1625nm Switch between Absolute power and Relative Power readings Operate and low power consumption LCD display screen shows the testing results With universal optic interface design FC converter for FC/SC/ST interface With auto power off (optional) and battery indicator Comes with English, Deutsch, Francais, Espanol, Italiano user manual Certification: CE, FCC, ROHS Specifications: Measuring range: -70 ~ 6dBm Wave Length: 850nm, 1300nm, 1310nm, 1490nm, 1550nm, 1625nm Resolution: 0.05 Accuracy: ≥-48dBm, ±2dBm ≤-48dBm, ±3.5dBm Units: dBm, dB Operation enviroment ≥-48dBm Temperature: 0~40°C (32~104°F) Humidity: 5~95% Operation enviroment ≤-48dBm Temperature: 0~32°C (32~89.6°F) Humidity: 5~80% Storage environment Temperature: 0~40°C (32~104°F) Humidity: 5~95%a Auto power off (10minutes idle) Power: 2 x 1.5V AAA Battery Weight: 59.22g (including battery) Set Includes: 1 x Optical Power Meter 2 x 1.5V AAA battery 1 x English User Manual