Most of them I've found have a probe that needs to be placed by the heat source so it can read the temperature. But these probes are attached by a long cable that's attached to the thermostat, like this one:
It has a plug that goes into the wall, a probe (the bottom cable), and an outlet where you plug in the heat mat.
My question is... how can I close my tank if I have to have the probe in there?? My 40 gal is one of those "snake proof" ones that has a lid that locks into place. There's no holes or anything for a snake to get out of... much less a cable. So I don't see how I could use these in a tank. Can someone clue me in?
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