Best thermal scope zeroing method

[finnbear270]

Finding this thread fascinating for all the innovative solutions. I love a bit of home electronics and pretty sure there must be a way with a couple of AA batteries and some wire you could rig up a suitable sacrificial/replaceable heat source

Battery pack on the floor. A meter of 20G/2 copper to a pair of clips
A short disposable section of single strand wire or tin sheet cut or coiled to your chosen target size

Challenge is seeing the POI if it's not on the target

If you remain in the aim, you should see the bullet hole as an individual hotspot for at least twenty seconds or so.