Korg CA-1 Solo Chromatic Tuner Features:

Ultracompact body with Tilt Slit
Ideal for brass band or orchestra
Large, high-precision LCD needle-style meter
Wide pitch-detection range from A0 to C8
Sound out reference tone from internal speaker
Adjustable calibration supports a variety of concert pitches
Auto power-off function
Memory backup function
Battery life: Approximately 100 hours of continuous use