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https://www.swelluk.com:443/aquarium-systems-seatest-ph-test-kit-2/ 
Aquarium Systems SeaTest - pH Test Kit
Aquarium Systems new pH Test Kit is the latest addition to their SeaTest range, which will quickly measure the acidity of water. pH is one of the most important values vital to maintaining the overall good health of your aquarium or pond and its inhabitants.
Product Information
Check the acidity of your aquarium or pond with Aquarium Systems pH Test Kit, suitable for both freshwater and seawater set-ups. Each pack contains 2 x 10ml for approximately 80 to 100 tests and can measure the pH between 4.0 and 10.0.
This pH test features a graduated 12-colour scale (4; 5; 6; 6.5; 6.7; 7; 7.3; 7.5; 8; 8.5; 9; 10), so you can easily and clearly check and track your pH level.
For a result accurate down to 0.01, use this pH test in combination with Aquarium Systems SeaTest Control.