Our customers tell us this is the brightest A/C dye - brighter means quicker and more accurate leak detection Stay-Brite A/C dyes will still fluoresce after 5 years - saves the technician valuable time locating leaks All Stay-Brite dyes are OEM approved - They will not harm the systems Easy-Measure 1 Oz. application bottle - provides accurate measurement of 1/4 Oz. per system - may use with #173510 universal injector Cost per application is less than other methods - the best can cost less Stay-Brite dyes mean quicker and more accurate leak detection. The 1 Oz. bottle contains enough dye for 4 applications. They will last longer (5 yrs. +) and will not harm any a/c system. The Stay-Brite Patented formulas give maximum brightness using a minimum amount of dye. Only 1/4 oz. needed for any automotive system.