Where do you place your thermostat probe?

[BostonMacK]

I don't even use a probe anymore. I bought a temp gun and that thing is a godsend.

How do you adjust the temps in your tank without havng a thermostat probe? A temp gun is great for instant surface readings but unless you plan on sitting by your enclosure 24/7 with your temp gun I don't see how just using a temp gun will work.