Optical power meters are commonly used to measure absolute light power in dBm. For dBm measurement of light transmission power, traceable calibration of fiber optic power meters is essential. A fiber optic power meter is also used with an optical light source for measuring loss or relative power level in dB. Alternatively, some users may prefer an integrated two-way LTS, or a simple LTS. All Kingfisher hand held optical power meters are coloured blue for easy identification, have interchangeable connectors, long battery life, traceable calibration certificates, 3 year warranty & calibration cycle. Kingfisher also offers a traceable optical meter calibration service. Also available in convenient F O Test Kits.