Michigan-O Color-Coded Probe Michigan-O Color-Coded Probe PQ2NM 3-6-8 QulixŖŖ probes are color-coded with accurate, smoothly finished black markings, which will not chip, flake or fade. 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.