>That is exactly what I was looking for.. but didn't know what to ask
>for.   And I had a picture of it in my mind, but assumed that a set
>would be prohibitively expensive.... looks like the set I'd want is only
>$222.06, which is perfectly acceptable.
>
>-forrest
>
>Alan Schnittman wrote:
>> The "right way" to do this is with a plug gauge (aka pin gauge).
>>
>> For example, http://www.mcmaster.com/#plug-gauges/=1lpzq2
>>

Hmm, I guess that would be fine where you are measuring lots of holes of the 
same size, but the device I had in mind is the last one on this page, I 
think.

http://www.mcmaster.com/#hole-gauges/=1m8rli

It has a tapered pin that slides in a tube. The pin is retracted, then 
pushed into the hole while the tube is butted against the material. When the 
pin has gone in as far as it can, the hole size can be read off a vernier 
scale. 

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