I was looking at the thermostats on reptilebasics,

http://www.reptilebasics.com/Thermostats-p-1-c-250.html

Does the Helix Controls DBS 1000 Proportional Thermostat

http://www.reptilebasics.com/Helix-C...t-p-16139.html

Control both hot and cool side temperatures? Or would I need one for both sides of the tank?