Directions:Attach Live pH to the inside of your aquarium using the suction cup. Once fully wet (1 - 2 hours), Live pH responds to pH changes in minutes. Compare the active membrane to the color reference blocks to determine your pH level. Replace the Live pH meter every 4 -6 weeks. For use in freshwater aquariums only.
Mardel Live pH Test Meter
Dimensions: 4.5"Length
Style: pH
Pack Size: Pack of 3