Chainsaw Repair

You still need a set of micrometers to measure the snap gauge. Still these are prone to error and the measurement process is arduous. 

Industry standard is a dial bore gauge (still need mics). There are some pretty decent cheap sets out there that do 2-6" with 0.0005" increments.

http://www.ebay.com/itm/Igaging-Engine-Cylinder-Dial-Indicator-Bore-Gauge-2-6-/141472741994?pt=LH_DefaultDomain_0&hash=item20f06eba6a

Or extender series stuff which has an extra head that goes done to 1.4".

http://www.ebay.com/itm/Fowler-Cylinder-Dial-Bore-Gage-1-4-to-6-/111608389384?hash=item19fc60df08&item=111608389384&pt=Motors_Automotive_Tools&vxp=mtr

Or you can get more precise ones in 0.0001" increments.

http://www.ebay.com/itm/2-6-x-0-0001-Dial-Bore-Gauge-Set-Brand-New-EE20-1006-/161510210358?pt=LH_DefaultDomain_2&hash=item259ac23b36

I personally have a 1.4-6" set with a digital gauge that reads in 0.00005" increments. It's way overkill.