Hirst Magnetics GM08 Gauss Meter, DC and 15 Hz → 10 kHz
999 mT, 0 → 29.99 mT, 299.9 mT, Minimum Magnetic Measurement: 0 T, 0 mT, Best Accuracy: ±1 %, Operating Units: Amps/m, Gauss, Oersteds, Tesla, Interface Type: 3V Analogue, RS232, USB, Maximum Operating Temperature: +50°C, Battery Type: AA, Dimensions: 175 x 89 x 40mm, Length: 175mm.