8$ Electrical Parameter Tester DIY
thingiverse
https://de.aliexpress.com/item/33v-3A-7in1-OLED-Multifunction-Tester-Voltage-current-Time-temperature-capacity-power-voltmeter-Ammeter-meter-white/ 0-33V 0-3A $8 https://de.aliexpress.com/item/Mayitr-10pcs-4mm-Banana-Socket-Nickel-Plated-Binding-Post-Nut-Banana-Plug-Jack-Connector-Red-Black/ I use a 9V battery for powering. Print 1 and 2 the same color, 3 different for the label.
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