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Micrometer, Digital Micrometer High Precision Outer Diameter Wall Thickness Caliper 0.001 Waterproof Electronic 0-25-50mm(Mechanics,0-25mm) 1.With lock clamp 2.With a benchmark poles 3.Blue smooth paint frame 4.Measuring surface with a hard alloy head 5.Ratchet locking devices or friction casing can ensure accuracy Micrometer, Digital Micrometer High Precision Outer Diameter Wall Thickness Caliper 0.001 Waterproof Electronic 0-25-50mm(Mechanics,0-25mm)