well i do suggest getiing the same ph tester as i have now and just doing it that way. mixed water into vile, 2 drops of liquid, match colour to chart, the guy instore gave me a free bottle of ph up, and i can use lemon juice for down so as of now my ph testing gear should of only cost MAX 25/30 euro. It will help kern because when you come on here, if ever, looking for help 90% of the time your gonna be asked ph in and ph out. i will be asking soon so i had to go get it