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I definitely like the first 1st the best. I like that the meter has the 3 colors in it. That's the problem I have with the last 3.
However, I think you could mix them together. Use the colors from the first one, but make the meter icon a part of the word.
The needle part of the meter on the 1st 2 look much better than the needle on the last 3. Those 3 make me see a syringe, rather than a needle on a meter.
All in all, I really like the 1st one.
