Summary
Measure several clean, dry points on each panel, then compare the results between symmetrical areas. A thickness gauge alone does not give a car's history: it mainly reveals discrepancies that may warrant closer inspection.
How to prepare the tester and the car body?
Clean the surface without thick polish and let it return to room temperature. Calibrate the device with the provided shims and select the substrate if necessary. Some testers distinguish steel and aluminum; others do not correctly measure composite or plastic elements.
Where to take measurements?
Take several readings at the center and near the edges of the hood, fenders, doors, pillars, and rear panels. Compare the left side to the right side. Avoid drawing conclusions from a single reading, as factory thickness naturally varies.
How to interpret a high value?
An area significantly thicker than neighboring panels may indicate repainting or body filler. An abrupt transition near an edge strengthens the suspicion. This does not necessarily prove a serious accident: a scratch or cosmetic defect may also have been repaired.
What to do after detecting a discrepancy?
Examine the joints, screws, alignments, and ask for invoices. In case of structural doubt, have the vehicle inspected by a professional. To perform comparative readings, consult the characteristics of our automotive paint thickness tester.