INFORMATION ABOUT THE AUTOMATIC ROBOTIC GUITAR TUNER

This device must be more than popular.  You put it around a tuner, like on the E string tuner or tuner for G string. You can also choose for an other tuning, like open D.
The point is, most of us have OR a single and simple tuner, analog or digital,
When I tune my guitar, I use a device, and more important my EARS. Imagine, playing in a band, a string completely out of tune, itis indeed MADNESS to use your device and to see how it turns your tuner automatic to the desired chord.
Big groups, they have at least 20 guitars on the backstage area on stage, hidden behind a curtain.
For those "professional guitar tuners" it is a blessing.
I was in a large music store, they had 100 of these devices, with a battery9V.
All these tuners were completely sold out within 24 hours.
I think and am convinced that this isn't a toy, or a useless tuner, because if you play since years as told: IF YOU USE A DIGITAL TUNER (like Korg, Boss) IT REMAINS IMPORTANT TO USE YOUR EARS, everytime I tune my guitar, with help, there is always a string who sounds to low, to high, and worse, playing E, or A, you don't hear it, but playing G, you hear it.
THIS SOLD OUT PHENOMENON proves that there is a big market. What's your opinion, and WHO HAS A AUTOMATIC ROBOTIC TUNER?