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What Difference between PM9 AA and BA model.

PM9 meter model BA is an update of PM9 AA model. It is essentially a new PM9.
The differences between AA and BA are the following:
(1) The AA model has Accurecy level of class 2. The BA model has of class 1.
(2) An additional Partial Energy counter available on Version BA and it is possible to reset this Partial Energy counter.
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