Actually, you get thread gauges from a machinist supply such as: http://www.mscdirect.com/ This is where I get most of my tools. Great folks. Get their "Big Book." Jim At 04:39 PM 8/19/2002 -0400, FlaFaces1@aol.com wrote: >a thread guage is the proper tool to measure threads in inches or metric. A >science supply waregouse should carry them? Don Mason