Geo
Engineering tool! I'm just a simple geologist, not an engineer. You can purchase a inside spring caliper at Home Depot for $10 or less, here's some examples http://www1.mscdirect.com/CGI/GSDRVSM?PMTYPE=&SITEXT=SPRING%20CALIPER . Yes if you want to use the tool for measuring inside diameters you'll need a micrometer or vernier caliper to measure the spread of the spring caliper, here's some more examples http://www.tresnainstrument.com/vernier_calipers.html but even those items can be cheaply obtained.
Steve

Last edited by Rockdoc; 05/22/09 05:00 PM.
Approach life like you do a yellow light - RUN IT! (Gail T.)