RM200D Residual Field Meter is portable instrument which measures the residual magnetisum in demagnetised iorn and steel objects. The unit can be operated on 9V battery as well as on external 9V DC regulated source. It is internally calibrated and it measures fields from 0.1 gauss to 200 gauss full scale.
The Hall Probe The Hall probe is made up of a highly pure Gallium Arsanide crystal. It is mounted on a non-magnetic substrate of 50mm(l) x 5mm(b) x 1mm(t) and is located at the front edge. It is encased in a pen type aluminum holder. Do not use the probe for temperature above 60 degree C. When not in use, the probe is to be capped.