Hello, I'm making an electronic load and want the ability to display the current reading. I need a panel LED voltmeter capable of measuring 1mV accuracy. (The eload has 1mV = 1mA in the current sense resistor.)
I've searched eBay and sent inquiries to sellers if their panel meters can go down that low.
Any tips on where I might be able to find such a volt panel meter capable of mV accuracy? Thanks.
You didn't say what range of voltage you want to measure.
DigiKey.com carries a few 3.5-digit (-1.999V to +1.999V) digital panel meters. They don't seem to stock them and the only one they list a price for is $112.
Have you thought of using an ammeter? They have 3.5-digit units for -1.999A to +1.999A (measure to the milliamp) or -199.9mA to +199.9mA (measure to the tenth of a milliamp). They start at only $54.
If you don't need to go above 1V you can use the analog input on an Arduino and display the output on an LCD of your choice.
I think my £6 digital multimeter will do what you want. If so just take one apart and hide the works behind your panel.
...R
Robin, that's a good idea. But I'm hoping for something more professional looking, and not "makerized." 
Anyways, found a meter at CircuitSpecialists.com that might work. Will work from 9V to 12VDC (which is good as mine is 9V battery powered, with option for 12VDC wall wart adapter.) Costs about $13 each.
BTW, I'm building Dave's EEVBlog electronic load, with some added twists, like multiple power mosfets run in parallel, each with their own opamp driver, a BNC output jack for easy connection to an oscilloscope (so you can see how DC/DC switching waveforms are affected by the varying load), and headers for connecting a 12V cooling fan (optional).
I plan to sell the extra prototype boards after I've built mine, so I didn't want hacking a multimeter to incorporate in this project. I'd prefer to use parts users can buy easily.
May be this can help you?
http://www.ebay.com/itm/4-1-2-Digital-DC2V-Voltage-Panel-Meter-Voltmeter-/320684620851
Seller has a lot of other meters.
And one more arduino electronic load: http://imall.iteadstudio.com/tools-and-equipment/im120723002.html
Not the best but real working device.