That little Homeworx cheapie is amazing. I’ve experienced the same (surprising) results and found that tuner to be excellent. Came across one in a Fry’s store in Vegas, garnered some good info from here, which validated my findings (thought I was seeing things 
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At first glance, and at $36, I didn’t know what to expect, but saw it as a fun, inexpensive little experiment. I think I spent more for lunch that day, so I really had nothing to lose. Turned out to be a fantastic discovery. Great, crazy little box!