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PAINT THICKNESS TESTER TGL-3

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TESTER OF LACQUER THICKNESS TGL-3

The new generation TGL-3 paint thickness tester is an electronic device for quick gauging the paint thickness by means of a comparative method. This method consists in comparing the obtained measurement result with the value corresponding to the factory paint thickness value, which is typical for a given make of a car. When the TGL-3 tester was being constructed, his method was chosen due to the fact that it is the most reliable for a user, who is most often interested not in the paint thickness expressed in micrometers, but the real difference between the car paint thickness and the thickness of the original factory paint finish. The TGL-3 tester can also measure the putty thickness ranging from 0 to 3 mm. The TGL-3 device makes it possible to determine whether the car has the original paint, it was repainted or whether under the paint there is, for example, a 3 mm layer of hard putty. This device can be used in all cars with body made from sheet steel. To perform the correct measurement, the dimensions of the flat surface must be at least 7 x 16 mm.

To determine the thickness of the varnish, follow these steps:

  1. Touch surface with the paint sensor, which is situated in the upper right part of the cover.
  2. Press the button on the cover labeled as T (Test).
  3. Read the highlighted number on the scale and compare with the reading corresponding to the thickness of the original paint thickness of a tested car. Release the button labeled as T (Test).

Interpretation of test results

The thickness of the varnish coating is illustrated by the visual representation on the tester scale:

  1. Highlighted number 1 (yellow) means that the coating is too thin and the varnish coating was put without putting the proper primer first. In practice, this means that this part was replaced.
  2. The numbers from 2 to 5 (green) correspond to the thickness of the original paint of different car makes.
  3. Figures 6 and 7 mean that the varnish layer is too thick or even a very small amount of hard putty (number 7).
  4. Figures 8, 9, 10 indicate that the varnish is putty; accordingly 1, 2, and 3 mm thick.
  5. If none of the numbers is highlighted during the test (indicator "Battery Status" lights up normally), it means that under the varnish layer, there is over 3mm of hard putty or that we are testing a plastic or aluminium component.

Note that cars with the anti-corrosion layer of zinc will have the summary thickness of the paint, which will be thicker yet by this layer.


The role of the varnish coating thickness.

Conservation functions, decorative and mechanical strength of body coating depend to a large extent on its thickness. Too thin a coating layer means small resistance to external factors and corrosion, it is also characterized by poor aesthetics. When the coating layer is too thin, it means that a given part of the body was varnished without a proper primer. Much more often very thick coatings can be found, which are most unfavourable. They result from the fact that several successive layers of varnish have been put on the layer made by the manufacturer, which is the most optimum paint thickness. These coatings are characterised by the inferior flexibility, adhesion, impact resistance and have a tendency to crack. The result is a significant deterioration of the protective properties. It very often happens for example, after a post-accident repair, that under the varnish coating there is a layer of hard putty, which in turn, if its thickness is excessive, has poor mechanical properties and is prone to cracking and peeling.


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Cost of delivery depends on the supplier and the country of destination.

Have a look at testing devices - DM-1.


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