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Yes and Yes. Meter's are not gospel so do not worry about not have a Bird 43 etc....Think of a meter as a tool that is relative not absolute in what it tells you. Meter's read both ways a Bird 43 or other types that use the same design are just easier to use because you simply turn rotate the slug to the direction you want to read. In your case you just need to hook it up back wards.


In terms of error in the reading your unit can be adjusted and internal parts can also be swapped out to bring the unit closer to a given certified reference but for what you want to do it is fine. Knowing how much error you have and subtracting that is easy to do not only for each range but for different power outputs along the needles movement on the scale.


Should you get to a point where your meter can not accurately read and display or you question your meter you can just take the voltage reading with your VOM and do the math!