In message , Andrew Gabriel
wrote
In article ,
Dave writes:
On the other hand, I did find it very difficult to balance my heating
with it. I ended up measuring the temp of the rad at point of entry and
exit. Trying to measure the pipes proved very variable.

They don't work on bare copper (looks like a mirror to IR).



See
http://www.omega.com/prodinfo/infraredthermometer.html

Check the section on emissivity. Note also the warning about the field
of view of the sensor - for a 15 mm pipe to fill the field of view you
may have to be as close as 4 inches.
--
Alan
news2006 {at} amac {dot} f2s {dot} com