Trident 660 temperature voltmeter addon
thingiverse
I am using this voltmeter / thermomether https://it.aliexpress.com/item/1005002289526408.html I custom-made the cap and a new glass with a sheet of clear perspex. I then used a black foil to make it dark . Another option could be to use the original cap and glass in this case you have to mod a little the 3d printed base I uploaded a step version just in case.
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