LedTester

As I am from the lighting industry, it has always bothered me that I had to power things up in order to measure the forward voltage of the LED string. For DC systems, most LED strings 
or COB-LED's (ChipOnBoard) are 6 or 12 LED's (18V / 36V) - but you never know.
The diode functionality of DMM's often doesn't even go up to 3V.

Here I am using the Aeneng M118 Multimeter as case. 

See full project on https://hackaday.io/project/181015-reuse-dmm-bodies

Software: https://github.com/Phoeboss/LED_Tester