You will want to get a GH ph drop test kit instead to test ph pf your watering mix, shooting typically for ph in low 6s. Those soil testers are garbage. go with 1/4-1/2 recommended dosage of any nutrients you are giving, and keep that consistent until the plants tell you otherwise. Let your soil dry out almost completely before watering each time. Always soak the soil completely with 20% runoff. Light feed every time you water. Less is more, except when it comes to light. Use Calmag, use good nutes. Read and post pictures, and read more!