There are three different types of coating thickness gauges available; coating thickeness gauges that measure non-magnetic coatings on magnetic substrates (for example paint or zinc on iron), coating thickness gauges that are capable of measuring non-metal coatings on non-magnetic substrates (for example paint on aluminium) and coating thickness gauges that can measure non-metal coatings on non-metal substrates (for example paint on wood or concrete).
The most common application is measurement of non-magnetic coatings on magnetic (ferrous) substrates, for instance measurement paint thickness on iron, or zinc thickness on iron. Analog coating thickness gauges use a magnet to test how much force is needed to pull the magnet off the material, when the coating is thicker the magnet is pulled off more easy. Digital coating thickness gauges use the principle of magnetic induction to determine the distance between the coating thickness gauge and the magnetic metal substrate. This measurement method can be very accurate, especially when surfaces are flat.
To measure non-metal coatings on non-magnetic (non-ferrous) metals, the distance between the coating thickness gauge and the metal substrate is measured using the Eddy Current principle. An example of this application is measurement of paint thickness on aluminum. Our digital coating thickness gauges can measure this application very accurately. There are also digital coating thickness gauges available that are combination ferrous and non-ferrous coating thickness gauges in one instrument. These gauges are delivered with a probe that is able to dertermine if the substrate is magnetic (ferrous) or non-magnetic (non-ferrous) and automatically select the correct substrate.
Measurement of non-metal coatings on non-metal substrates, for instance measurement of paint on wood or concrete, can be done with an ultrasonic coating thickness gauge. This coating thickness gauge measures the coating only by sending an ultrasonic wave into the coating and measuring how long it takes to reflect the signal against the back-wall of the coating. This means that coating and paint thickness can be measured on any substrate. The advanced models can even measure thickness of individual paint layers. When a surface has been painted 3 times the advanced models can determine the thickness of all individual paint layers.
Please select one of the coating thickness gauges below and click an image for detailed product information.