Digital calipers, as with many other devices that have digital readouts, create an illusion of accuracy by reading to more decimal places than the device is capable of resolving. Their rack and pinion mechanism introduces multiple sources of error--the slop in how the rack and pinion are cut, slop in the pinion bearing, and slop in how the rack and pinion engage. And that is all before the pinion rotation gets translated from analog to digital.
None of those issues exist with a simple vernier caliper. I can't understand those who think they are hard to read (especially if they think they can build a guitar!).
If you are locating frets by measuring and marking, you cannot get any more accurate than using a good rule (Starrett, Mitutoyo, etc.) marked in 1/100ths, a knife, and mildly magnifying glasses if you don't have perfect vision. Cheap rules are often shockingly far off.
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"Still a man hears what he wants to hear, and disregards the rest."
--Paul Simon
Last edited by Howard Klepper; 02-16-2019 at 01:40 PM.
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