Here's a handy nozzle diameter and material dial I've made.

It glues on the printer with double sided tape, no screws or glue necessary otherwise, press fit and can be disassembled easily. Make sure the indicator is pointing upwards and that's it. You can add small washer between dials for tighter fit but it's not necessary.

ZnCu = brass nozzle

Cu = copper nozzle

WC = tungsten carbide / hardened nozzle

SS = stainless steel nozzle

Enjoy! :)