Williams Color-Coded Probe Williams Color-Coded Probe PQW8 Single-ended, color-coded probe. Ergonomic, ResinEight™ handle. Williams. SKU Handle PQW8 #8 ResinEight™™ PQW7 #7 Satin Steel™ Colours™ PQW #30 Round PQW6 #6 Satin Steel™ 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.