DMM 20.000 counts or 30.000 counts for Process Control applications?

[Kiriakos GR]

Process Control application 4~20mA this can be served in full by a 20.000 counts DMM.
You may disable DMM auto-range, so the DMM this to stay permanently at specific range = higher amount of visible digits on the display.

But by the numbers, a 30.000 counts DMM this has an advantage.
At 4~20mA DC application, this will have relative range at 30mA.
If you use as signal injector (calibrator), a device with analog controls?   
No matter if the output exceeds temporarily the 20mA mark, the DMM this will stay all times within the range.

The gain is less hassle at configuring the instrument.

From the other hand if you own an 100% digitally controlled source,  the precise delivery of 20mA as max, this will not drive the DMM, this ranging up by it self.

Now lets talk about numbers.
Analog controlled 4~20mA source = 500 EUR
Digitally controlled 4~20mA source = 1600 + EUR