Morning Ode,

Or modify yours with the addition of a potentiometer and ammeter , get a PPM/TDS or uS meter and watch yours like a hawk.

  I understand what you are saying and follow the logic.

  If one wanted to use a fixed range ammeter, what should this range be?

I have some very good digital meters that are in fact millivolt meters. The numerals are near 1 inch tall. They have considerable configuration capability, including decimal placement. They are either 4 or 5 digits.

I used these to display mm Hg in a medical product I used to manufacture. They can also be used to display temperature, or virtually any other status.

With the use of a meter shunt, I could set one of these up to display current. Likely I could use a low value of 1 % resistor to accomplish current indication. I have used a number of meter shunts before, but none for this low value of current.

 Of course it is easier to simply use a good Multimeter.

Wayne

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