The trimeter is a great asset to my garden. I don't know how I ever grew with out it LOL. With aeroponics reservoir temps are absolutely vital, and with any system PH is vital. The EC meter is great but not seriously needed in most types of gardening. Today the res temps dropped down to 58F and I was scared. I am not sure what effects this has on the root structure and development but I knew it couldn't be good. Temps are now at a safe 66F phew!!. I lowered the EC a bit to .55 and the PH down to 5.2. The PH gradually rises and this is good depending on how high it goes. I think that it is good because not all nutrients can be taken up at any specific PH. So that is why I allow mine to fluctuate between 5.2 and 6.0, but I try to stay in the 5.4-5.8 range... makes sense right. I wanted to share this thread with anyone that is a DIYer like me. It is a collection of ALL SORTS of different DIY related threads, I hope you enjoy.