The only thing required from this device is an accurate measurement of pipe temperature. I bought this as a backup to my much more expensive Fieldpiece. Well, when I needed it, I could tell right away that the numbers he was giving me weren't even remotely plausible. I suspect it's because of the bad angle that the clamp is holding the thermocouple plate against the tube. I ended up buying another Fieldpiece clip for $60. They don't have to be that expensive, but obviously you have to spend that much to get one that works.
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