I bought the HANMATEK TI120 Thermal Imager from AliExpress a few weeks ago. It was about £150…claimed rez 320×240 and battery life 6 hrs.
I use the greyscale setting, and with a mild visible-light overlay.
First, I used it to do a quick sweep of all the plugs, sockets, wall warts etc in the house …all seemed OK. So that in itself, for the peace of mind, is worth the price.
Then I went outside to have a look at the house…roofs definitely lose heat, as do CombiBoiler exhausts.
I’ll wait till it gets a bit chillier to give my shed a thorough check.
Ches