Thickness Gauges

h = v x t / 2 is the whole principle. What decides accuracy is how well those two variables are measured.

Swap the probe on the same gauge and the range and accuracy change. Buyers compare main units; what decides whether a measurement is possible is the probe.

The cost of a bad thickness reading is rarely rework. It is a thin wall that was never flagged. The maintenance routine is what keeps the number signable.

The question we hear most is simply “which method for my substrate”. Here is how the three main routes divide the work.

The common mistake is starting with price and appearance. The right order is: substrate and coating decide the principle, measuring position decides the form.