Ilia Baranov has designed a reference business card:
Back of card includes:
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- Ruler in both 1/10″ and mm.
- AWG Hole size gauge (not super accurate due to plating, but that is unavoidable)
- Resistor/capacitor/inductor/diode sizes
- Common surface mount component sizes
- Common electrical symbols and shortcuts/equations
- Common conversions
- Trace size comparison
- Quote from Dune!
Project info at Mr.Robot site. It’s also up on Tindie.