The patented pH-Fix technology stands for a high quality, color-fixed pH test strip system. To prevent bleeding, the pH-indicator is chemically bound to the cellulose fiber. Unlike classic pHpapers, pH-Fix effectively protects the sample against contamination and enables measurements even in weakly buffered or strongly alkaline solutions. Four different color blocks for each pH-value ensure highly precise pH-determination and make the application rapid and reliable. 100 strips/pack.