Both GlutenTox Pro and GlutenTox Sticks can test that surfaces are gluten free. The procedure is identical, however GlutenTox Sticks require some additional equipment: a pipette to measure 100µ of dilution solution, and a microwell plate (disposable plates are included with the kit) or 1.5mL tube to put the dilution solution and test strip into. No equipment is required to test surfaces for gluten with GlutenTox Pro.
In response to many of our clients who must test difficult-to-reach nooks and crannies, we have also developed a method to test surfaces with GlutenTox using a cotton swab (not provided with the kit; use any cotton-based swab of your choosing). This method is slightly less sensitive than applying the test strip directly to the surface, and can instead detect surface gluten to a minimum level of 5ppm.
Keep in mind that applying a parts per million designation to surface testing is different than food testing: after all, no one is eating the countertops! The ppm designation indicates the amount of gluten that would be present in a kilogram of absolutely gluten-free dough, after that dough were kneaded on the surface in question.
Check out our illustrated video instructions for testing hard surfaces for gluten contamination, or scroll down for printed guides!