DIN Rail Mount DC Voltmeter

 I was setting up a DIN rail mounted 12VDC power supply for my permanently mounted telescope in my observatory.  Got it mounted in a 19" rack with a network switch and a rack mounted power strip, not b/c I need it, but b/c I wanted it.  Thought I'd put voltmeters on the AC side and the DC side, just b/c it would be fun and allow me to watch voltage while the scope is slewing to ensure voltage isn't dipping too much when the scope mount draws maximum current.

DIN rail mounted AC voltmeters are common and cheap.  The one I bought has a hole in the back that you pass the hot wire through on your AC input to monitor current. I guess there's a coil build into the device. Got that mounted and working.  

But try to find a DIN rail mounted DC volt meter.  I could not.  It's absurd.  Why do we need to monitor AC volts, but not DC volts.  But using my extensive powers of research from being an industrial planner, I could not find what I was looking for. 

So I built one.  

I used these two components: 

1.08 Width Universal DIN Rail Mount Clip Snap in Din-Rail Mounting Brackets DIN Rail Fixed Clamp Aluminum Alloy Solid State Relay Clip for 35mm Din Rail Black 4-Pack for $14.90 on Amazon

https://smile.amazon.com/dp/B09QJ15K1L?psc=1&ref=ppx_yo2ov_dt_b_product_details

and 

Car Digital Voltmeter Gauge DC 12V, Waterproof LED Digital Display Voltmeter for Car Motorcycle, Power Energy LED Volt Meter for Car Battery Voltage Monitor (Red) for $11.89 on Amazon

https://smile.amazon.com/dp/B0787QFQ5N?psc=1&ref=ppx_yo2ov_dt_b_product_details

The meter comes with a piece of double-sided sticky tape.  I used TWO of the DIN rail mount clips, cleaned the surface with alcohol so the tape would stick permanently, and also cleaned the back of the meter.  I had a DIN rail mounted DC terminal board already, so just landed the red and black wires appropriately. 

Simple. Cheap. And it works.  It's the thing on the far left of the DIN rail.  I cranked the power supply up to 14VDC b/c the telescope mount likes that.