The Kel McNaughton Caliper is the only caliper on the market that will accurately measure both sidewall thickness and bottom thickness with minimal tangential error, unlike traditional double-ended calipers. Available in two sizes, the Standard Caliper will measure bowls or vessels up to225mm (9") deep and 350mm (14") wide, the Large Caliper will measure 325mm (13") deep and 500mm (20") wide. All steel construction. is designed for use on hollow forms such as narrow neck vases, as well as with more open vessels like bowls.

Please see the User Guide for more information.