It conforms to BS 3900-C5, ISO 2808-7B and ASTM D4414-A Standards. Caltech's wet film thickness gauge is designed to measure accurate liquid coating thickness in the easiest and fastest manner. It measures the thickness immediately after the coating has been applied on the material.WFT Gauge can also be used to measure powder coating thickness before it goes through curing. Wet film thickness is measured to determine the correct dry coating thickness