For use with all DeFelsko Type 2 magnetic, eddy-current and ultrasonic coating thickness gauges. Plastic shims simulate a coating over a particular substrate material or shape. Gage performance can be conveniently verified on a regular basis as required by some international test methods. Protects the probe from damage or premature wear when placed over hot or abrasive surfaces. Can be placed on top of soft or tacky coating films to obtain thickness measurements without the gauge probe depressing the coating film. Non-Certified shims provide a quick operational check of the instrument by allowing the user to perform practice measurements Complete set of 5, each shim is packaged in their own plastic protective pouch, Certificate of Calibration included.