Auto-On Rechargeable Clip Tuner

The WST-645 is designed around one idea: tuning should take zero extra steps. Flip it up on your headstock and it powers on automatically; tilt it back down and it shuts off — no power button to hunt for between songs. This tilt-activated design, first introduced by Cherub in 2013, has become one of the brand's signature features.

Beyond the convenience, the WST-645 packs a high-sensitivity piezo sensor for ±1 cent accuracy, five tuning modes for guitar, bass, and ukulele, and a compensated guitar tuning mode inspired by James Taylor's approach to chord intonation. A rechargeable lithium battery keeps it running for hours between USB-C charges.

Auto-On / Auto-Off
Simply tilt the tuner up to power on and down to power off — no button presses required.

5 Tuning Modes
Chromatic, Guitar (Standard), Guitar (Compensated), Bass, and Ukulele modes for a wide range of instruments.

±1 Cent Accuracy
A high-sensitivity built-in piezo sensor keeps tuning precise on stage or in the studio.

Rechargeable Li-ion Battery
USB-C charging delivers up to 6 hours of continuous use per charge.

Bright Color Display
Easy-to-read screen stays visible in both dark venues and well-lit rehearsal spaces.

Compact & Lightweight
At roughly 25g, it clips on and stays out of the way while you play.