If I also need TENS pads to give me the frequencies when perform pulse scan?

Yes, you need to use Spooky2 TENS pads when you do biofeedback scan. Or you can also use Spooky2 hand cylinders.
When biofeedback scan, Spooky2 TENS pads or hand cylinders will give frequency on your body, Spooky2 pulse will monitor the feedback of your body and find hits.