Don Felder - Here is a shot of my pedal board which always includes a Peterson tuner. I've used their products both in the studio and on the road now for decades
Tools for the Task: Mini Pedal Tuners - Premier Guitar
Korg Pitchblack XS
Guitar Effect Pedals - Tuner Pedals | Liberty Park Music
KLIQ TinyTune Tuner Pedal for Guitar and Bass - Mini - Chromatic - with Pitch Calibration and Flat Tuning (Power Supply Required) : Amazon.co.uk: Musical Instruments & DJ
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A Beginners Guide To Pedalboards Pt. 1: Choosing Your Pedals — EarthQuaker Devices
Guitar Tuner Pedal | Gear4music
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The Studio Pedalboard
BOSS Tu-3 Chromatic Guitar Tuner Pedal : Amazon.co.uk: Musical Instruments & DJ