CP-12/Thin Williams Color-Coded Probe CP-12/Thin Williams Color-Coded Probe PCP12/QOW6 Double-ended probe. Ergonomic, Satin Steel™ handle. Thin Williams. 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.