Originally Posted by lamarguy
The $65 controller is the older TS series and includes a temp probe. The $45 controller is the newer TS2 series and I don't believe it includes a temp probe. Also, the one you linked to requires 240v.
See the TS2 series
for more information.
Doh! Ah yes. Reading the actual info on the manufacturer's site. You'd think I'd have thought of that!!