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The Terra Aquatica liquid pH tester is perfect for easy testing and as a backup to your digital meter. Covering a wide range, from 4.0 to 8.5, the kit gives up to 500 tests with 30 mL.
To use: Simply fill the supplied test tube halfway with nutrient solution, add two drops of pH Test Indicator, shake and compare the resulting colour with the chart to read your pH level.
For full technical specs on the Terra Aquatica liquid pH tester please click this link.