Reason to Calibrate Coating Thickness Gauge

Calibration of coating thickness gauges will be affected by the type of material, the shape and the surface finish of the metal substrate to be tested.

For example the magnetic properties of steel alloys vary and the conductivity of different aluminium alloys and different non-ferrous metals, copper, brass, stainless steel etc. also vary. These variations can affect the linearity of a coating thickness gauge.

This means that a gauge set-up on mild steel for example will read a different value for the same thickness coating on high carbon steel. Similar linearity effects are seen on thin or curved substrates and particularly on profiled substrates such as blast cleaned steel used for structural steelworks.

To overcome these effects most coating thickness gauges have features that allow you to set the gauge to the work being carried out, thus maximum the accuracy of the readings.