• I'd go for a decent quality 150 mm vernier caliper, but they take a bit of practice to read. There's nothing to go wrong on them though and no batteries to run out. 0.02 mm resolution is good enough for most day to day measurements. Mine's an RS branded one, but it's 20 years old so I've no idea if they're still good. I would assume so.

    If you want a digital caliper it's worth spending as much as you can I reckon. I've got some Mitutoyo ones that are fantastic. All of the cheaper ones I've used have been disappointing in one way or another - battery life, button function, feel, etc.

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