I think it's the one you can re-purpose when not in use. Get a good quality thermostat (I like herpstat) and put your materials together in a way that conserves their integrity. For example, I only had one clutch which meant I could transfer over the heat mat and thermostat for use with my 5 hatching tubs. After they moved along some of the stuff is not in use, but it could be. I didn't know at first that the drain hole on a cooler could be unscrewed, but it can, so now if I wanted to I could re-screw in the drain and the hinges and have a like-new cooler except for a couple random small screws on the outside. P.s., I didn't use the recycled cpu fan so ignore that, and the accurite was replaced by a small zoomed 2 in 1 hygro/thermometer.
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