Chu's Proportion Gauge Chu's Proportion Gauge PROGS Used for quick, accurate measurements during a crown lengthening procedure. Includes 1 Handle, 2 T-Bar Tips, and 2 Inline Tips. SKU Handle PROGS Satin PROG #8 ResinEight™ Where to Buy x Category Dealer PartnersSales RepresentativeStrategic MarketsSchools RepresentativeAccutron™ Equipment Sales Zip Code Find RepresentativeReset Select a category, input a zip code and click on Find Representative, or explore the complete list here.