Free Sulfite Test Strips, 10-500 ppm [Vial of 50 Plastic Strips]

Easy to read color blocks at 10, 50, 100, 250, and 500ppm.Rapid test only taking 15 seconds to test a solutionNo need for field kit or reagents to conduct testsDesiccant vial with flip-top lid preserves freshness of stripsRecommended for lemon juice or on potatoes, shellfish or dried fruit. Not recommended for red wine or people that are sulfite sensitive testing for allergens