5KM - 10 km optical power meter red pen red light machine optical fiber optical power meter tester red pen

Red light machine optical power: the ability to measure absolute optical power value 850/980/1300/1310/1490/1550 / 1625nm wavelengths and other seven， the test range: -70dBm ~ + 10dBm; 10MW normal red light to measure the optical fiber a distance of about 10 km