This microphone-based guitar tuning app plays a sound whenever your string is even slightly in tune. I have to mute my mic if I want to make sure a string is fully
LC5 Band Acoustic Electric Guitar Preamplifier EQ Equalizer Pickup Tuner with Microphone | Wish
Online Guitar Tuner - ProGuitar
5 Band Acoustic Guitar EQ Preamp Prener-PM EQ Equalizer Pickup Tuner LCD W/ Mic | eBay
GGP-05 Acoustic Guitar Pickup LCD Digital Tuner Pickup Preamp EQ With Microphone | eBay