Here's another buyer's-remorse-I'm-over-that-now tool, An HSFTOOLS F2W thermal camera.
I've wanted one for years, but, well, cost. That said, I decided to bite the bullet and dropped the $300.00, after doing a lot of looking around.
Now, I can look at our ceiling, in the 105 F heat, and see where every 2x4 of each truss is. That thermal bridging thing (heat carried in and out of a house by way of those 2x's that seem like they should work like insulation, but don't). I can see the major heat leaks at each light can. I can see that 3-1/2" of insulation is 12", or more, less R38 insulation I should have. Both for comfort in the most severe weather and for adding to the life of the HVAC and heat pump system.
I can look at that house and shop power panel and see the one breaker (or more) is running hotter than I like, so the connections at the breaker and the outlets downstream should be checked for solid connections, to minimize fire risk.
I can look at an outlet and see if it's running hot and in need of attention.
I can look at powered electronics boards and see if there is a hotspot developing.
I can look at a motor, electrical or gas, and see if it's running hotter than it should be.
I can see where insulation is lacking in exterior walls.
I can look into my backyard on one of those nights you cannot see your hand in front of your face and see the wildlife, or undesirables infiltrating by territory.
I can use the imager to find water leaks (cooler spots).
AND there is that whole, "how is your Rocket Stove working" thing
. . . .
https://www.amazon.com/HSFTOOLS-F2W-Thermal-Resolution-Carrying/dp/B0D8WC31Y9/ref=asc_df_B0D8WC31Y9?mcid=d02b7a38d90239a88c2ca9ab410b2034&hvocijid=1398380972963075953-B0D8WC31Y9-&hvexpln=73&tag=hyprod-20&linkCode=df0&hvadid=721245378154&hvpos=&hvnetw=g&hvrand=1398380972963075953&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9033649&hvtargid=pla-2281435180218&psc=1