[Amps] Meters

[ANTHONY JAPHA]

Ampers,
I'm sure some of you have tried digital meters in your amps.

Will a digital 30A meter (or similar range) follow keying or speech and display useful readings, or will it be too slow to be useful?

Another question: if a digital meter would be useful, can I use any 30A ( or larger) shunt, i.e. one made for any old analog meter, as a shunt to turn a 200mv digital meter into a 30A reading meter?

Many tnx and 73,
Tony, N2UN