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The Western Instruments’ Imperial Pocket Pit Gauge is useful for measuring the pit on a curvature. The Pocket Pit Gauge features a reversible blade for measurement on flat and curved surfaces.

To zero on a compound curvature, reverse to the spot side, and loosen the set screw holding the dial indicator. Place the blade on a similar curve to the area to be inspected. Gently set on surface and tighten the set screw to clamp the dial indicator, then proceed to measure the pit on a compound curvature.