Nvis 621 Gauss and Tesla meter is used to measure the magnetic field Intensity. It operates on the principle of Hall Effect. It is highly accurate and stable instrument for the measurement of magnetic field. It measures the magnetic field with the help of InAs sensor. This instrument is very useful in different Industries, Research Institutes and Laboratories. InAs sensor is provided with a nonmagnetic casing for its safety. The readout is digital with Gauss and Tesla Unit.