Photonix PX-B200 Techlite High Performance Power Meter features are: quad wavelength with relative mode; very fast dual processor design; wavelength 850nm, 1300nm, 1310nm, 1550nm; range (1300 to 1550nm) +3 to 60 dBm, and for 850nm +8 to 55 dBm; resolution 0.01 dB; Ge detector; large character graphic display dB, dBm; analog type tuning bar; rugged aluminum packaging; universal adapter head; nicad, alkaline, or ac operation; one hour quick charge feature; waterproof carry case.