About the Tompkins Bowl Gauge 

"I wouldn't be able to complete many of my turnings without careful planning and the ability to take precise measurements. Unable to locate measuring tools  accurate enough to meet my requirements,  I began designing my own out of necessity.  My bowl gauge is the result of refining and perfecting my original concept over time.  The frame is molded of glass-filled polycarbonate, all moving parts are brass or stainless steel.  The spherical measuring points won't scratch surfaces being measured, and help compensate for user error.  The design of the gauge allows measuring across the foot of bowls as well as producing accurate measurements of wall thickness. Keith Tompkins "

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