Detail 01
±1 cent accuracy
Tight enough for intonating an instrument, not just rough tuning. A cent is about a hundredth of a semitone.
Product detailSKU #1274034492374
BOSSTU-3 Chromatic Tuner Pedal
1/2
Independent shopping perspective
The Korena take
Chromatic pedal tuner with ±1 cent accuracy and a bright display. The default choice for anyone tuning on a stage or a board.
Strong match
Who this is for
- Gigging players who need to tune silently between songs
- Outdoor and bright-stage use where clip-on displays wash out
- First pedal on a board that also needs a power pass-through point
Consider the trade-offs
When to look elsewhere
- Bedroom players happy with a phone app or clip-on
- Anyone needing sweetened or preset tunings for a specific instrument
- Boards with zero spare space — a clip-on takes none
What matters in use
The specifications, translated
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 02
Tuning range C0 to C8
Covers low B on a 5-string bass through the top of a guitar's range, so one tuner handles both instruments.
Detail 03
Reference pitch A4=436-445Hz in 1Hz steps
Lets you match a piano or horn section that isn't at concert 440. Set it once and it stays.
Detail 04
High Brightness mode, 85mA draw
Readable in daylight, but it nearly triples current use. Check your power supply's per-output rating.
Detail 05
30mA normal draw, 9V battery or adapter
Runs off a standard 9V supply. Battery works but a tuner left on will drain one over a few gigs.
Detail 06
Chromatic
Reads any note, so it works for drop tunings and alternate tunings without switching modes.
Final check
Know before you order
- 01No power adapter included — 9V supply or battery
- 02Battery access needs the thumbscrew pedal opened, not a rear hatch
- 03High Brightness mode may exceed some daisy-chain power outputs
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Will it work with a bass?
Yes. The C0 to C8 range covers low B on a 5-string bass through the guitar's upper register, and it's chromatic so any tuning reads.
02Does it mute my signal when tuning?
It's a pedal tuner meant to sit first in the chain, so you can engage it to tune between songs rather than tuning through the amp.
03Can I run it on a battery?
Yes, a 9V carbon or alkaline battery. An adapter is more practical for regular use since tuners tend to stay powered.
04Can I tune to something other than A440?
Yes. Reference pitch adjusts from 436 to 445Hz in 1Hz steps for matching pianos, horns, or older recordings.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
1 detailsConnections & power
- Power Supply
- DC 9V: Dry battery 6F22 (9V) type (carbon), Dry battery 6LR61 (9V) type (alkaline), AC Adaptor
4 detailsSize & weight
- Depth
- 5-1/8 inch
- Width
- 2-7/8 inch
- Weight
- 14
- Height
- 2-3/8 inch
4 detailsOther
- Reference Pitch
- A4=436-445Hz (1Hz step)
- Tuning Accuracy
- ±1 cent
- Tuning Range
- C0 (16.35Hz) -C8 (4,186Hz)
- Current Draw
- 30 mA (DC 9V), 85mA (DC 9V, when High Brightness mode is on)
