Fiber optic power meter features ingaas (pm20c or pm20ch) or si (pm20a) sensors wavelength range: 400 nm - 1100 nm (si) 800 nm - 1700 nm (ingaas) power ranges: -60 dbm to 16 dbm (1 nw - 40 mw) for pm20a -60 dbm to 13 dbm (1 nw - 20 mw) for pm20c -50 dbm to 23 dbm (10 nw - 200 mw) for pm20ch interchangeable fiber connector, fc/pc adapter included (fc/apc, sc, st, lc, or sma adapters can be ordered separately) absolute and relative measurements displayed in w, dbm, db nist-traceable wavelength calibration in 5 nm steps 50 hours of operation between charges the pm20 series of fiber optic power meters are robust, full-featured, handheld instruments, which together cover the full range of optical fiber applications within the 400 - 1700 nm range with optical powers ranging from -60 dbm to +23 dbm (1 nw - 200 mw). a rugged enclosure, internal