WOW! How many of those things do you get for that price? I bought a really nice expensive PH controller once, now it's just a monitor. It's not good to tie your PH down, you can't see what it's doing. If you get a bacterial boom you may not notice cause you just are assuming everything is being taken care of. Once your dialed in your PH will stabilize, and if it go berserk, you need to know why and address it. Like in flower when it starts dropping EC/PPM your PH will alert you first. Ph isn't into bondage. Monitor instead control. Cheaper/less stuff for the garage sale.