Calibration standards are meant for verifying coating gauges - These plastic foils and shims are acting as standards.

• Labelling with both metric and imperial units

Plastic shims are used for quick measurements when placed over metal to protect the probe from rough or hot surfaces.

A thickness gauge can measure shim coating over a smooth metal surface (zero plate). Certified plastic shims can be placed over an uncoated metal - Not suitable for use with magnetic pull-off gages.