This is by far the best guitar tuner I have ever owned or used. The build construction and design is awesome. I'm very pleased with it and I have NOT experienced any grounding loop problems at all and it's a very quiet guitar tuner. I don't even know it on. I do buy good guitar amps and not cheap guitar amps that can create noise and grounding loops problems due to poor design. I'm also glad that Peterson decided to use hot glue to stop wires from flopping around. This will insure that the wires will not break due to movement and will ensure many dependable years of use due to using hot glue. I design test programs for electronic devices, cables, etc. and I realize the importance of using hot glue to support and stop wires from flopping around so that wires do not break. That's a very smart move on Peterson's part.