Seeya - I'm measuring the temps with a digital thermometer (the one with a probe, like everyone recommends) and my thermostat probe/whatever you want to call that is between my UTH and the tub. I'm measuring the temp on top of the newspaper with a temp gun (and I've done it under, but since there isn't much newspaper the temp didn't change). And I always heard 90-94 was perfect for hot spot...