It’s not too difficult to test the voltage outputs from a Eurorack power supply, but it isn’t as easy to test current, because you have to put the meter in series between the supply and the module. For ease of testing both voltage and current there is the Joranalogue Test 3 Voltage and Ma DIY kit.

The module comes only in DIY, which makes sense because most users who want this meter are DIY people. It’s a very simple build that took me about 45 minutes. The kit can be built in two different ways, with or without the front panel. If you build it without the panel, the power input is mounted on the top side and the LEDS are mounted close to the PCB. Then you can mount the meter on a flat surface for use on your bench.

I used the panel, both to protect the circuitry and for installation in one of my small test cases.