Mini Voltmeter
thingiverse
Simple Voltmeter (0-30V) https://www.amazon.com/MCIGICM-Voltage-2-5V-30V-Digital-Voltmeter/dp/B07Q2RQYPJ/ref=sr_1_36?crid=340PVD3H1AIR6&keywords=voltmeter&qid=1568107519&s=gateway&sprefix=voltm%2Caps%2C236&sr=8-36 Connect The yellow wire and red wire on the switch in order to link the probe with the positive pin.
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