Used only at home. I think it's relatively clean. Operation confirmed. All strings can be analyzed simultaneously. True bypass and buffer switching available. Excellent as a high-quality buffer. There probably isn't a better tuner. There may be minor scratches from use, so please refrain from purchasing if you are sensitive to such things. The PolyTune 3, with its high-precision tuning function, is perfect for guitar adjustments, preserving the signal with its TRUE/BUFFER function. - Model: PolyTune 3 - Functions: TRUE / BUFFER - Accessories: Box, manual, sticker - Brand: tc electronic Thank you for viewing. Type... Electric Guitar #t.c.electronic #tuner