Technical Standards for Gauss Meter: -Measurement Range: 0~200mT~2000mT (1mT=10Gs) -Intrinsic Error: the reading of+/-2.0% +/-2 words -Resolution:0.1mT -Zero Drift: 30min of less than 3 characters -Ambient Temperature:5 degrees centigrade to 40 degrees centigrade -Relative Humidity; 20 per cent to 80 per cent(non-congealable dew) -Power supply :One 9V battery -Overall dimension:131*66*26mm -Instrument weight:150g -Display usage:3 1/2LCD