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From:
Frank House <[log in to unmask]>
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Date:
Sun, 28 May 2017 08:51:19 +0100
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Jonathan,

I agree with Andrew about the ubiquitous cheap electronic callipers.

If you watch out for "offers" there are good mechanical callipers to be 
had.  I have a Starrett instrument which when tested against a Mitotuyo 
micrometer (also a special offer -- I'm a cheapskate, but find precision 
tools hard to resist) gives good concordance and repeatability.  Both 
have the great advantage of not requiring a battery. The calliper has a 
mechanical dial fitted which makes things easier in awkward spaces, but 
for measuring off the reel I prefer to read the vernier.  Mind you, 
nowadays I need good light and short-focus spectacles.

Frank.


On 28/05/17 02:40, Andrew Bernard wrote:
 > Hello Johnathan,
 >
 > Good question. You could use a digital caliper such as the iGaging EZ-Cal
 > IP54 Digital Caliper. This has narrow jaws, as most do, that can fit 
in the
 > string band. It's accurate to 0.001" with repeatability of 0.0005". The
 > reason I mention such a brand is to alert you to stay away from the
 > infinite cheap calipers for $10 that have flooded the internet.
-- 
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