This meter is only designed for testing voltage.
Two threaded ports on the two sides. One side is for a battery/mod that has 510 threading. The other one is for 510 atomizers.
When battery is turned on, connect the volt meter and mod/battery, press the button of mod/battery and the currant voltage will be shown.
Another usage is to test the voltage when you vaping. Connect the volt meter with mod/battery and 510 atomizers and you will see the voltage when you are vaping.
But this usage is not recommended as it may damage your mod/battery.
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