I bought the DC1100 Pro meter, and am wondering if it's working correctly. The "bar graph" jumps from near-zero to near-full scale, seemingly at random, very quickly (every few seconds) and I can't figure out what information this is telling me (and it looks so erratic that I wonder if it's defective). Does the bar graph on yours jump erratically? Is it useful for anything?

(as an aside, after all the talk I've heard about this meter, I'm disappointed - seems like a cheap toy that someone built in their garage...)