PH TEST LIQUID PRO - 20 ML (400 MEASUREMENTS) PH tester for hydroponic or aqueous solutions with a wide range from 4.0 to 11 Liquid pH indicator for checking nutrient solutions that can carry out up to 400 measurements. • The correct pH is essential for normal and abundant growth • Scale from pH 4 to pH 11 • The kit contains a bottle with solution, a test tube with stopper, instructions and a color card • 400 measurements • Economical Here are those correct values for your cultivation: Soil cultivation: between 5.8 and 6.4 Hydroponic / aeroponic cultivation: between 5.5 and 6.0