For those folks that have a Ranco temperature controller and are looking for additional sensors there is a Ebay auction item for 12 Ranco sensors. Here is the link http://cgi.ebay.com/Lot-of-Sensors-from-Ranco-control_W0QQitemZ330182532635QQihZ014QQcategoryZ53296QQssPageNameZWDVWQQrdZ1QQcmdZViewItem