The Mitutoyo 146-131 Micrometer offers a unique spindle design with 1/4-in. disks. That allows it to measure outside diameter up to one inch, and inside diameter within 0.55 to 1.050 inches.

The selection of calipers under test. Left: sub £1 plastic Vernier caliper, centre: Mitutoyo 530-122 Vernier caliper, right: cheap digital caliper. I’ve amassed a selection of both for comparison.

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When comparing micrometers we had three of them, a Mitutoyo and a Moore & Wright representing decent quality, and an £8 ($9.41) Daniu from Banggood from the cheaper end of the market.