I got the Mastercool 52224-A a while back:
Mastercool 52224-A-SP Infrared Thermometer w/ Laser
I found it very useful up in the attic when I was looking for weaknesses (gaps)
in the newly installed insulation. It was very easy to locate heat leaks and mark them (on a diagram) for extra attention.
The laser made it very convenient to check out the areas where I could not reach easily.
I had a 15 foot pole with a small screw-on scrub brush on the end, that I used
to reach out and adjust the posistion of the rolled out insulation..
Using my leak diagram, I was able to close up all the leaks and then
quickly re-check them with the sensor pistol afterwards.
I have been using the 'pistol' a lot since we got the Sanyo installed.
It's very convenient to walk into a room and laser a cushion or bed
and get a very accurate temperature reading..
It's helping me to know how well (and how fast) heat from the Sanyo is getting into the other rooms.
A valuable tool..