Help with thermostat!!

[The Serpent Merchant]

One of mine is the old kind and doesn't have the safety relay. Also, I like having the second probe. If for some reason one got knocked off it would shut off and I would notice a temp difference on the display.

The new ones have software that detects if a probe has come lose and shuts power off to the heat source/sounds the alarm. Basically if the thermostat can't get the probe to read the set temperature in 30 minutes it figures that the probe has been dislodged. This is one of the many features that I believe makes the herpstat the best/safest thermostat available right now.