There are tuners and there is Peterson.
SC- 1 Clip-On Strobe Tuner
Featured: ACU Sweetened Tuning® for acoustic
guitar in standard tuning that compensates for
capo use or heavy playing style.
0.1 Cent Accuracy | Metal & Carbon Fiber Design | Sustained Tuning Mode Option
29 Tuning Presets Including Exclusive Peterson Sweeteners™ and Buzz Feiten® Settings
Trusted by professionals since 1948.
The Sound of Precision