Analog Voltmeters or Ammeters

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Static or slow changing signals can be displayed with analog voltmeters or ammeters (with a suitable resistor in series). A +-1mA meter has the advantage that the output can directly be interpreted as machine units.

Note that The Analog Thing ships with a digital Voltmeter.

Products

You can basically use any Multimeter, see for instance https://www.reichelt.de/multimeter-c541.html?CCOUNTRY=445&LANGUAGE=de. Cheap but suitable ones begin at around 20EUR.
Here is an analog device for tinkering purposes: Aliexpress item 4000377192769

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