1. XHT -A Teslameter increase the function of analog output based on Teslameter XHT-I. 2. XHT_B Teslameter increase the function of interface RS232 based -on Teslameter XHT-I. 3. Every Teslameter is equippe with one standard probe, with the dimension of 1.5 x 2.8x28+¦¤16x55 mm. Specific probe need to be ordered preliminarily. 4. XHT-I, XHT-A, XHT-B Teslameter can be equipped with two probes, but must add the price of one probe to the standard price. 5. XHT-V Teslameter is the former Model ST-9701. TECHNICAL SPECIFICATION OF XHT TESLA METER Model range Accuracy (%FS) Range limit Resolution Sample speed per second display mode limit switch mode power supply First Limit Second Limit Third Limit First Limit Second Limit Third Limit XHT-V 0~2 +/-1.0 0~200mT 0.2~2T   0.1mT 1mT   3~5 3 1/2 LED automatic 3.6V Charge Cell XHT-IV 0~2 +/-5.0 0~200mT 0.2~2T   0.1mT 1mT   3~5 3 1/2 LCD automatic 9V Terrace Cell XHT-III 0~2 +/-1.0 0~200mT 0.2~2T   0.1mT 1mT   3~5 3 1/2 LED automatic 220V+10% AC XHT-II 0~2 +/-0.5 0~200mT 0.2~2T   0.1mT 0.01mT   3~5 4 1/2 LED automatic 220V+10% AC XHT-I 0~2 +/-0.2 0~200mT 0.2~2T   0.1mT 0.01mT   3~10 4 1/2 LED automatic 220V+10% AC XHT-A 0~2 +/-0.2 0~200mT 0.2~2T   0.1mT 0.01mT   3~10 4 1/2 LED automatic 220V+10% AC XHT-B 0~2 +/-0.2 0~200mT 0.2~2T   0.1mT 0.01mT   3~10 4 1/2 LED automatic 220V+10% AC

The most common tesla meter are based on the induction principle and consist of an inductance coil and an electrical measuring instrument. When a change occurs in the magnetic flux linkage between the inductance coil and the magnetic field whose induction is to be determined, an electromotive force, which is measured by the instrument, is generated in the coil. In constant magnetic fields the flux linkage changes as a result of linear displacement, rotation, or vibration of the inductance coil; in variable magnetic fields the change in flux linkage results from a change in the magnitude and direction of the field. Flux meters are used as the measuring instruments in the case of constant fields; voltmeters, oscillographs, and other such devices are used in the case of variable fields.

Tesla meter are used to measure the horizontal and vertical components of the geomagnetic field intensity vector—for example, in magnetic mapping and geological prospecting. They are also employed in research on magnetism, particularly for measuring the magnetic fields of the planets in the solar system and of the interplanetary medium.