Testing your water quality can be complicated but test strips can help you simplify your testing routine. These strips can be dipped directly into your aquarium: no test tubes or separate samples are required. Highly precise color charts make it easy to determine aquarium levels to keep your fish healthy and thriving. These strips test a wide range of pH levels in freshwater and saltwater aquariums. Highly precise color charts. Dip directly into aquarium no separate vial needed. Includes information on how to correct unsafe water conditions. For fresh and salt water. 25 Strips.