I like Zoo Med stuff but i hate their UTHs. I use only Fluker or Ultratherm for prewired UTHs. For heat tapes, i prefer flexwatt. Havent tried the fire retardant stuff yet since all my flexwatt is still working fine.
And if your hot spot isnt getting over 73F, you did something wrong lol. Put your hand on it and see if it feels warm. If it does, then it clearly over 73F as our body temp is 98F. So your temp unit would be faulty.
But like mentioned, a temp gun is pretty much a must have item.
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