API Freshwater pH Test Kit – Accurate Water Testing for Aquariums, Ponds & Fish Tanks | Monitor Water Quality for Healthy Fish & Plants

pH is the measure of acidity of water.  A pH reading of 7.0 is neutral.  A pH higher than 7.0 is alkaline, and a pH lower than 7.0 is acidic.  Maintaining the aquarium at the proper pH ensures optimal water quality.  The pH should be tested weekly, since natural materials in the aquarium (such as fish waste and uneaten food) can cause pH shifts.

• Reads pH from 6.0 to 7.6
• For freshwater use only