pH Low Range 6.0-7.6 for Freshwater, 225-Tests Suitable for freshwater aquariums to establish the right pH range for your fish (6.0-7.6) Monitors ammonia toxicity level Best used in aquariums containing most common tropical fish, such as Tetras, Discus, Tanks pH levels should be monitored regularly as they have a direct effect on the well-being and health of fish Easy to follow directions; Contains 225 Tests