That's right.. after countless hours of experimentation and just as many sleepless nights, I'm finally ready to unleash to the world..
The Super Ultimate Deluxe LED Tester Workstation (Pro-Edition) VERSION 2.0!!!

This one includes a
5K trimpot in series with a 560ohm resistor (for minimum LED protection). This allows you to dial in the
exact brightness you want (a feature built into most of my production pedals).
Not only that, but there are sockets underneath the trimpot for
probing with your DMM to find out
exactly what resistance your favorite brightness is!
Then you can double-check that resistance value by heading over to the other side and plugging in a
fixed resistor to test.
And of course if you just want to check if an LED is working or not, simply use the on-board
3V coin battery
"I thought the SUDLEDTW-PE (v.1.0) was crazy-cool, but it's really a piece of shit compared to the SUDLEDTW-PE V.2.0! It's pure unadulterated f*#king genius!" -me