these are hard to find and not cheap but I would guess it is something like this, that product line has square ones as well.
https://www.digikey.com/en/products/...64-502/4212765
I have used a TEC from a dead laser as well, no clue on accuracy though. would be fun to try though
Last edited by Draco; 11-03-2023 at 03:52.
Remember Remember The 8th of November, When No One Stood, but Kneel, In Surrender
In a popular government when the laws have ceased to be executed, as this can come only from the corruption of the republic, the state is already lost. Montesquieu