Magnetic fields are vector quantities characterized by both strength and direction. The strength of a magnetic field is measured in units of tesla in the SI units, and in gauss in the cgs system of units; Resolution is the smallest change in a magnetic field the magnetometer can resolve.
DX series Gaussmeter or Teslameter is a magnetometer that measures magnetic fields such as AC and DC magnetic fields, radiation magnetic fields, residual magnetism, earth magnetic field, etc.
DX-102 Portable DC Gaussmeter
▶ Battery: low voltage 6V (lithium battery) power supply design;
▶ Range: 30.0mT, 300mT, 3000mT three gears;
▶ The accuracy is better than: 1.0% below 1T, 2.0% above 1T;
▶ No measurement within 60 seconds, automatic shutdown;
▶ The minimum resolution of the magnetic field: 0.1mT (1Gs);
▶ Volume: 170mm×90mm×40mm;
DX-102F Portable AC and DC Gaussmeter
▶ DC Range: ±30kGs, ±6kGs, ±600Gs DC
▶ AC Range: ±3.6kGs, ±1.2kGs, ±120Gs RMS
▶ Test resolution: 10Gs, 1Gs, 0.1Gs
▶ DC Accuracy: (1% reading +0.05%range) @ 25℃±5℃
▶ AC Accuracy: ±3% reading @ 25℃±10℃ (30Hz - 10kHz, sinusoidal wave)
▶ Display unit: G, T, A/m
DX-360 Three Dimensional Gauss Meter
▶ Supply power: 100/120v 200/240v ; 50-60 Hz
▶ Range: 3G (300µT)/ 300G (30mT)/ 3kG/(300mT) /30kG (3T) /100kG/(10T)
▶ One dimensional DC Accuracy: ±0.05% of reading , ±0.005% of range
▶ Three dimensional DC Accuracy: ±0.15% of reading , ±0.005% of range
▶ AC Accuracy: ±1% of reading , ±0. 5% of the range
▶ Resolution: 0.1mGs(0.01uT)
▶ AC Frequency Range: 20Hz to 30kHz
▶ Additional effects: Temperature coefficient ±(0.015% ±1 count)/ ºC
▶ Panel display: VGA,800 x 480 Pixel, 7'' color screen
Refer to
https://www.dexinmag.com/gaussmeter 
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