Is that tester have 2 long probes and a needle and then you switch to ph, moisture or light. Those things are junk, go and get a ph test kit, comes with testing drops and ph up and ph down. Or get a digital tester, ph is very important and you cant be guessing. I had one of those testers from lowes made by rapitest and it wasnt worth squatt. The moisture part was okay but thats it.