I really need 2 digits, 3 would be nice. There is definitely a difference between say .64v and .65v.

The difference between 0.64 V and 0.65 V is less than 1.6%. So the questions are: (1) Does a change/error/uncertainty of 1.6% really make a difference and, even more to the point, (2) is your circuit/system really up to the point of performing to that level of accuracy and precision? If both of those are yes, then a 3-digit meter is warranted. If not, then I wouldn't spend a lot of time looking for one if a 2-digit meter is easy to get your hands on.

 

I see what you mean, and while technically that would work, the people who will be using the tool (basically the general public) are not that technical and wouldn't understand it, and wouldn't be willing to figure it out. I'm currently selling a product into this space, and creating this new tool would 1-up my competition. So while technically it needs to be accurate, politically it also needs to be as simple as possible and non-intimidating. People like knobs and LCD displays.

How about up/down buttons instead of knobs? Which do you think your market would prefer?

 

People like knobs and LCD displays.

Fair enough... gonna think about it more thoroughly, and get back to here if an idea comes to mind. Good luck!

 

How about up/down buttons instead of knobs? Which do you think your market would prefer?

Say, that's a neat, feasible idea... an up/down button used to select one of 24 possible settings, which are shown using a two-digit LED (and not LCD) display.