You got plenty of good advice, so no need for me to add to it. But once you get the right gizmo plugged in, and the right app running on the laptop, it's liter

You got plenty of good advice, so no need for me to add to it. But once you get the right gizmo plugged in, and the right app running on the laptop, it's literally as simple as walking around looking at a spectrum graph. Sure, you can do more fancy stuff, but for the basic level that's it.