Arduino Voltage Measurement

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how can read voltage circuit tapping through socket.
for example have laptop charger. how can read voltage drawn laptop tapping through socket charger of laptop plugged in?
sorry bad english :)

isn't enough read label on charger?  old hp charger says 19.5v, lenovo says 20v.
if have sharp probes, can poke thru insulation , measure voltage on wires.
be careful, , apply insulation on holes when done.


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