I need to rig up some thermometers in my tank so that I know what's going on. While I'm impressed with nofossil's instrumentation capabilities, I don't have the technical know-how or interest in getting quite that fancy. What I would like is two or three remote-sensing, digital thermometers in the right range, i.e., going up to 200 degrees or higher. Nofo made a couple of good suggestions in another thread. Meat thermometers are always an option for me. They can be attached to a pipe and give a pretty accurate reading, in my experience. However, I doubt anyone makes a remote-bulb meat thermometer, though I haven't shopped around, so I really don't know. Another possibility nofossil suggested would be conventional indoor/outdoor thermometers, but he said that you absolutely can't get the sensor wet, which kind of precludes their use in the tank. However, it occurs to me that if I put the sensor between the liner and the insulation, the sensor would stay dry and the only thing between it and the water will be 45 mils of epdm rubber. Any thoughts on whether that would give an accurate reading if positioned at the bottom of the tank, with perhaps another one near the top? As long as there's flow, meat thermos attached to pipes going into and out of the tank should be good enough, but I'd like to monitor the status of the tank even when nothing is moving. Maybe that's not an issue; I confess I really haven't thought that one through, either. Some days it's easier to make long-winded posts and let others do the thinking for you.