The axial probe with teslameter LZ641H is used to measure the constant magnetic field and the magnetic field is generated by direct current (DC) as well as the the alternating magnetic field and the magnetic field is generated by alternating current (AC). Thanks to its construction enables the measurements of the magnetic field in a induction coil or perpendicular to the magnetic surface. The principle of work is based on the Hall effect. The Hall-sensor itself is located on the end of the probe. The probe has a 5-pin connector to the teslameter.