I am not familiar with the menu on the vv v3, but is there an option in the menu where you tell it what to display on the screen when you press the fire button?
If so and if it can be set to display resistance, then either it will show the resistance with that setting or else it will show NON.
No. To see the resistance with a vv3, you press both bottom buttons at once, and the first number is the resistance -- or NON in this case.
It's defective; you need to return it for a replacement.
Andria