I got it last Monday. The diagrams on the 1 page instruction sheet gave me an immediate pause.... the text next to the controller inset reads "Controller host (invite see to test the right diagram" The other diagram of the controller is marked as: "Controller host
The temperature adjusts the knob
The wording of the Limited Warranty on the other hand is spot on and clearly states what is not covered
I have the heater and the temperature probe in my sump. It reads 1 degeree less than the thermometer probe (Digital Big Temp) placed about halfway down on the back wall in the tank center.
This unit holds the temp steady overnight even if I left a window open and the outside temp got into the low 40's at night (inside temp was down to high 60's).
The digital controller is easy to read for temp. and clearly shows when the unit is on. The adjustment knob for the temperature is cleary not accurately marked, but does get you within a degree or two. You probably need to make some minor adjustments over a period of days to get it set exactly where you want it. I did, but now that it is set it works great, and keeps the tank temp stable at night.