Every workshop should have a have a pair of digital calipers.
They are very inexpensive nowadays ~$25.00.
Even the cheap ones are good as they give repeatable results.
My old vernier calipers were thrown away years back.
If, however, you need to send measurements to others, consider using a micrometer.
You might want to carry a pair in a holster like they did in the 60s with slide rules 
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If you havenât used a pair of calipers, these images might be of interest.
