This is the wonderful Optec temperature-compensated focuser. I have the focuser, temperature probe, and all the cables, including the one to connect it to your computer so you can use FocusMax, CCDSoft or many other programs to automatically focus.
I have purchased an FLI DF-2 digital focuser that I can use on more of my scopes, so the TCF-S is an extra item right now.
I will include your choice of adapters to attach this to your scope: a Tak 2.7" adapter or a Celestron C11/C14 adapter. You can buy other adapters from Optec or one of their dealers.
$600 for the whole thing, UPS ground shipping included; save almost $300 over the new cost.