You found my thread here I see.
All about detectors subsection,,,titled Nokta Impact information
You read this thread a few times,,receive your detector.
Operate your detector a little.
Then read the entire thread again.
Use your detector a few days,,,and gather some questions in your mind,,and then reread the thread again.
I guarantee you will see a lot of what is talked about in thread,,,you may be second guessing yourself while using your Impact,,,guess what though??
If what I have said in thread is more or less mirroring what you are seeing and or hearing,,,you then can scratch the second guess off your list.
I will answer any question I can about your new detector,,now or even later.
You can post your question down in the Impact thread if you wish.