When I started this hobby I bought this new pH controller only to use it as a pH monitor. Anyhow I figure someone else might be able to put this to better use i.e. as a "controller". It's an American Marine Pinpoint pH controller and it works perfectly. I put it on Ebay (item #170281269399) the auction starts at $1 with no reserve (if it goes for $2 so be it) so keep an eye out if you want a great price on one of these units.