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.