A wheel-shaped thickness gauge made of stainless steel to check thickness of fresh and wet film. Test method The central circle is of smaller diameter and is eccentric of the two outer circles. By rolling the gauge through a wet coating, the centre disc eventually touches the film. This point on the scale indicates the thickness. If the volume to solids ratio of the coating is known, then the wet film thickness can be used to predict the dry film. NEURTEK S.A. SE RESERVA EL DERECHO DE MODIFICACION SIN PREVIO AVISO. Scale Range 0 to 25 mils 0 to 50 mils 0 to 125 mils 0 to 250 mils 0 to 500 mils 0 to 1.000 mils Calibration ZPEX037 WHEEL Calibration (5 to 10 points) with traceability