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Micrometer, High Precision 0.001mm Electronic Outer Diameter Micrometer 0-25mm Digital Caliper Thickness Gauge Micrometer Base Stand Holder(Micrometer)
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
https://www.bizrate.co.uk/homehardware/micrometer-high-precision-0-001mm-electronic-oid40436574158.html