The DeFelsko PRBSPG-B PosiTector SPG Surface Profile Gage Integral Probe Only is designed to measure and record peak to valley surface profile heights on blasted steel. Measures and records peak to valley surface profile heights. All probes feature durable Alumina wear face and tungsten carbide tip for long life and continued accuracy. 0 to 500 um (0 – 20 mils) PT-SPGCS Models. + (0.2 mils + 5%) + (5 microns + 5%). 137 x 61 x 28 mm (5.4″ x 2.4″ x 1.1). 140 g 4.9 oz. ASTM D4417-B, AS 3894.5-C (with optional 30° tip angle), U. Navy NSI 009-32, SANS 5772 and others.