I originally bought this product through a third party supplier of Amazons. The unit was covered in a white powdery substance that I wrote and asked Peterson directly about. They informed me the white powder was not normal and the serial number on this unit was originally sold to Latin America. It was really great to see a manufacturer so concerned about not only their product but their customer. I immediately returned it to Amazon and purchased a BRAND NEW one from Sweetwater.
The unit is perfect. Does everything the manufacturer claims. I read a couple of the negative reviews stating the unit was cheaply made. Nothing about this unit screamed cheap to me. I checked the harmonics on my guitar with my clip on tuner. They showed dead on, however I could hear they were slightly out. This unit immediately showed they were out, and with the strobe just how much. My guitars have never sounded better. This unit should be in every performing musicians gig bag or on their work bench.
For guitar players everywhere, thank you Peterson for a great department, and for your excellent customer service.