For Building Surveys and Powerlines. -Features Benefits :Compact and lightDisplays readings in microTeslas (?T) ormilliGauss (mG) on triple readout 3-1/2digit LCDData and peak holdLogs data for uploading to a PC via RS-232CE and RoHS approvedSpecifications :Measurement Range: 0 to 2000 mG (0 to200?T)Measurement Accuracy: ?4 percent + 3 digitsResolution: 0.1 mG (0.01?T)Bandwidth: 30 to 300 HzSampling Period: 0.4 secondsOperating Temperature:32? to 104?F (0? to 40?C)Dimensions: 4.37 x 2.52 x 1.34 in.(111 x 64 x 34mm)Weight: 5.82 oz. (165g)Power Source: 1 ?9V? battery (included)Includes :Interfacing/Data logging softwareRS-232 cableBattery