Quick answer: Choose a coating thickness gauge by 4 things: (1) substrate — magnetic steel (Fe), non-ferrous metal (NFe) or non-metal; (2) non-destructive or destructive; (3) single or multilayer; (4) range and standard (ISO 2808).

1. Substrate decides the technology

For example Byko-test 9500 measures Fe/NFe non-destructively; BYK-µPELT measures multilayer by ultrasound.

2. Non-destructive or destructive?

Non-destructive (NDT) is fast and leaves the sample intact — ideal for volume QC. Destructive methods (cross-section microscopy like Byko-cut) give a visual layer cross-section for verification.

3. Single or multilayer?

For total thickness on metal, magnetic/eddy is enough. For individual layer thickness (primer, base, clear) on any substrate, choose ultrasonic PELT.

4. Range & standards

Pick a range covering your product, suitable resolution, and compliance with ISO 2808 / ISO 2178 / ISO 2360. Prefer gauges with traceable calibration.

Frequently asked questions

Can a thickness gauge measure on plastic?
Magnetic/eddy gauges only measure coatings on metal. For plastic, wood or per-layer thickness, use an ultrasonic gauge such as BYK-µPELT.
What's the difference between Fe and NFe?
Fe measures coatings on iron/steel (magnetic); NFe measures on non-ferrous metals like aluminium and copper (eddy current). Fe/NFe units auto-detect.
Does K&K calibrate thickness gauges?
Yes — with a traceable calibration certificate, training and a 12-month warranty.