Two micropressor-controlled menu-driven instruments which will measure the magnetic flux density and magnetic field strength of DC, AC and peak magnetic fields in S.I c.g.s units.,The GM08 has additional features USB and RS232 interface for data down load and remote control PC link. (Analogue)Menu driven. DC\/AC\/PEAK\/MAX\/HOLD\/STORE functions . Operating function and units displayed . RS232, USB Interface (GM08). Battery operated. External power supply connection (GM08). Multi-lingual . Thin semi-flexible probe. Transverse and axial probes are fully compatible. Dimensions: 40mm x 89mm x 175mm (GM07 & GM08)Magnetic Range = 0 - 2.999 mT, 0 - 29.99 mT, 0 - 299.9 mT, 0 - 3 TMaximum Magnetic Measurement = 2.999 mT, 3 T, 29.99 mT, 299.9 mTMinimum Magnetic Measurement = 0 mT, 0 TBest Accuracy = ±1 %Frequency Range = 15 Hz - 10 kHzOperating Units = Amps\/m, Gauss, Oersteds, TeslaInterface Type = RS232, USBMaximum Operating Temperature = +50°CMinimum Operating Temperature = 0°CBattery Type = AA