True.. I did get 2 duds back to back from Amazon on the Apera PH8500 series. This 3rd one I got direct from Apera, and it has performed well so far..(like 2 weeks). It holds calibration for the day, and I calibrate every day. If i'm a little suspicious, I'll dip the tip in the 7.0 just to make sure before I test the mix (liquid), or testing soil 24 hours after water/feed. This tool literally saved my crop. 3 weeks into veg, my shit starting going down hill.. I was racking my brain trying to figure out what what going on.. Lights? Nutes?, RH? Temps?.. We got the PH8500 in and poked the soil to find 5.1 ph. We had to compensate in an extreme way that is not for the faint of heart. We mixed at 10.5-11.5 to get it to settle at ~6.4-6.8 .. then we found out how important it really is. This crop made a stupid turn around and is going to be our best crop so far. Even tho
@Renfro had a bad experience, he taught me how important it is to know your medium's PH. I truly believe that 90% of peoples problems are PH related. If this unit dies on me, I'll go another route for sure. Pictured is Ethos Orange Kush Cake beginning week 5.