17/Thin Williams Color-Coded Expro 17/Thin Williams Color-Coded Expro XP17/QOW A double-ended instrument with an explorer on one end and a probe on the other. Excellent for dental examinations and charting. 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.