Update: When I set up the M5 for a “floor test”, I turned the unit on and heard a really bad noise, much like the wheel on the older model flashers. Also, I couldn’t get a proper reading even after adjusting the gain up and down. To make a long story short, I got a bad unit “out of the box”, and the company I purchased it from is making it good and replacing the unit at no charge to me.
Poop happens I guess!