1020.1 Apparatus
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- (a) Magnetic or electronic gauge, reading range 0-40 mils (0-1000 μm).
- (b) Micrometer capable of measuring to 0.0001 in. (0.00254 mm) and accurate to within at least 0.001 in. (0.0254 mm).
- (c) Rule with suitable graduations to accurately measure the material to be inspected.
- (d) The Corrugated Metal Pipe (CMP) Inspection Guide.