
What’s the Ranco
http://www.jehmco.com/html/temperature_controller.html
Manual
http://s3.pexsupply.com/manuals/1283530359689/38736_PROD_FILE.pdf
Mentioned here:
http://reefkeeping.com/issues/2003-06/nftt/index.php
(Replacing since I have an Apex now with two temp probes)