I have a small improvement to what OP posted - if you attach the UTH to the bottom of the tank and put the probe between the bottom and the UTH, you will likely get some sort of air gap, thus you'll get different temperatures in different places. Additionaly you will probably need to lift up your tank a bit so it doesnt just lay on the probe with its weight (Ive lifted it up using four rubber legs). I've attached my UTH to the bottom of my tank with aluminum tape and attached the thermostat probe (also using two thin strips of aluminum tape) to the bottom side of the heat mat. This way my UTH fits perfectly to the bottom of the tank, without any air gaps, and my thermometer placed inside reads almost identical temps as my thermostat
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