Thin Williams/CP-11.5B Screening Color-Coded Probe Thin Williams/CP-11.5B Screening Color-Coded Probe PCPQOW11.5 Double-ended, color-coded probe. Round, Stainless Steel handle. Thin Williams/Screening probe. 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.