Pocket Pit Gauge
The Reversible Blade of the Pocket Pit Gauge (N88-4) is used to measure isolated pitting with its two Contact Surfaces, a 1.5" (38mm) long Knife Edge Blade, as well as a Spot Blade with two Reference Points that are 0.375" (9.5mm) apart. The Spot Blade is used on Compound Curvatures such as the Knuckle of a Vessel Head, Pumps (Body/Impeller), Valves (Body/Ball), Propellers, Turbine Blades, Gas Cylinders, etc.. The operator performs a rough Height Zero, on a non-corroded surface with a similar shape, followed by a Scale Zero. The Pocket Pit Gauge is placed on a curved surface, at the same orientation as zeroed, to measure the Pit Depth.