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[Solved] What's the 4-20ma percentage fuction on DMMs used for?

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ballsystemlord:
In the spread sheet here: https://www.eevblog.com/forum/testgear/multimeter-spreadsheet/
There's a function listed as 4-20ma. It's explained in the thread that it means that the DMM reads:
0% for 4ma
50% for 12ma and
100% for 20ma.

What is this useful for? Like aside from LED current draw?

Thanks!

ataradov:
It is a standard control current for industrial applications. https://en.wikipedia.org/wiki/Current_loop

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