Calvin wrote



IR thermometers are the work of the devil. They are *very*
difficult to use and even in the hands of an expert can often give
misleading results.

That is cobblers! They give very quick - and reasonably accurate -
readings, which is what you need when you are checking a *lot* of
radiators in quick succession.


Sorry, I'm in a bit of a bad mood today and my previous post was a
little simplistic. Allow me to explain...

I still agree with Set Square. Each rad you check will generally be of the
same material and finish at each end. We are less interested in the actual
temperature than the drop, so a lot of the problems you describe don't
matter.

And from personal experience, I can get my system more or less balanced
easily, before I had the IR I wasn't in with a prayer.

--

mike