How to Order FO600 Standard Power FO610 High Power Measurement Ranges +5 to -70 dBm +25 to -50 dBm Resoiution 0.01 dB 0.01 dB Absolute Accuracy ± 0.15 dB(0 to -45 dB) ± 0.15 dB(0 to -45 dB) NIST Traceable Calibrated Wavelengths 850, 1310, 1550m 850, 1310, 1550m Battery Life 9V batteies /> 200 hours Dimensions 6.5 x 3.5 x 1.1"(166 x 88 x 28mm) Weight 11 oz (318g)