Lovibond Photometer Phenol Red Test Tablets are used for testing the pH of your water for all commercial digital test kits.Lovibond Phenol Red Photometer Test Tablets. Test the pH of your pool or spa water. Use this product with the domestic test kits. All Lovibond Chlorine Test Tablets have a minimum of 5 years before their expiration date. pH Testing Phenol Red Test Tablets - Phenol Red test tablet are used for testing the pH of your water. Having your pool water in the 7.2 to 7.6 ph range will ensure your water is ideal for your chlorine to work properly and bather comfort. Please see our beginners guide to pH pdf download for further assistance. The tablets are also the latest blister pack technology enabling a simple pop action to remove the tablets. Please remeber it is very important that you DO NOT TOUCH the individual test tablets once they have been popped out of the blister pack, as the contaminants on your fingers could give false readings. The tablet needs to go from the