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Autool BT280 - Polarity Test

Autool BT280
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Positive /
Negative test
14
How to use
Connect the probe negative clip to the vehicle ground wire, use
the probe tip to find the positive / negative wire of the electric
circuit system. The following interface is displayed default state:
Positive Interface
After detected positive signal, it will display voltage values and
positive (+) symbol.
Negative Interface
After detected negative signal, it will display ground icon and
negative (+) symbol.