What is the name of this tool?

Dunno if cranks are usually heat treated, though- I thought decent ally cranks are mostly forged items??

the op didn't say what type of cranks they are, or i missed it :)
i think its something like ally = forged, hot or cold, mostly cold because of the strength advantage which also means you can make things lighter
and cro-mo = heat treated
dont quote me on it though :)

Okay

I normally use a small IR thermometer in conjunction with the heat gun.

I understand your point but actually I know heat treatment only from chainrings and bmx cranks, so mostly cro-mo stuff and not alloy like those Miche cranks I was removing, so I guess I should be fine.

oh, ok
if you stayed at 80 you should be fine
again, don't quote me on it :)