If accuracy is important, do not use a coated thickness standard to set the calibration for a particular job. You must use foils, shims over the workpiece or identical substrate to calibrate the instrument for accurate measurement. Coated plates supplied are 0 to 20 mil range. Other size range thicknesses are available on request. Ferrous and non-ferrous versions available. Talk to BlastOne for a full range of coating thickness measuring equipment.