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Cosari PitchLock Pro

A ±0.5-cent clip-on tuner with a bright full-color display you can read in direct sun, a nitro-safe silicone clamp, and.

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  • 12-Hr USB-C Rechargeable, zero coin cells
  • ±0.5-Cent Instant Lock in 0.04 seconds
  • Sunlight-Readable Full-Color LED with 360° swivel
  • Nitro-Safe Silicone Clamp for guitar, bass, ukulele &
Cosari PitchLock Pro
Free Tracked Shippingin 1 to 4 business days
30-Day Home Trialtry it risk-free at home
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24-Hour Supportfast, helpful customer care

Built for Players Who Want to Spend Their Time Playing

Every part of the PitchLock Pro fixes something that broke, dimmed or died on the tuner you had before.

±0.5-Cent Piezo Lock

Reads the string in 0.04 seconds and holds steady, with no jumping meter on your low E.

12-Hr USB-C Battery

A 55-minute charge gives 12 hours of tuning. Use the same cable as your phone.

360° Swivel View

The dual-axis joint aims the screen straight at your eyes on any headstock, right- or left-handed.

Nitro-Safe Padded Clamp

Thick silicone pads with no plasticizers protect lacquer finishes, even if you leave it on for days.

How the PitchLock Pro Works

The Clamp Feels the String

The Clamp Feels the String

The spring-loaded jaw presses the piezo sensor against the headstock wood. It reads string vibration directly, so room noise never reaches it.

Swivel It Toward You

Swivel It Toward You

Rotate the dual-axis joint in any direction until the screen faces you. It holds that angle while you play.

Charge Over USB-C

Charge Over USB-C

Plug in the included braided cable for about 55 minutes. You get 12 hours of tuning, and the 3-minute auto-sleep stretches that across weeks.

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Excellent4.8 (247)Trustpilot

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Cosari PitchLock Pro

USB-C Rechargeable 360° Clip-On Chromatic Tuner for Guitar, Bass, Ukulele & Violin

Backed by our 30-Day Money-Back Trial & Full 2-Year Cosari Warranty.

$24.99 $49.99 Free Tracked Shipping Included

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30-Day Money-Back Guarantee plus a full 2-Year Warranty.

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Description

Accuracy you can hear:: ±0.5-cent precision across 27.5 Hz to 4,186 Hz means open chords ring cleanly and low strings like Drop D and 5-string bass B lock without a harmonic.

Made for real gig bags:: A reinforced dual-axis swivel replaces the thin plastic ball joint that snaps on cheaper clip-ons, and it folds flat to sit in a case pocket.

Set it once:: Choose Chromatic, Guitar, Bass, Ukulele or Violin mode and an A4 reference from 430 to 450 Hz. It remembers both after it powers down.

Shipping & 30-Day Returns

Free Shipping: Every order ships free with full tracking within 24 hours.

30-Day Trial: Try it at home for 30 days risk-free. Need help? Email us anytime at support@buycosari.com.

2-Year Warranty: If anything goes wrong within 2 years, we replace it free of charge or refund your order in full.

Why Choose the Cosari PitchLock Pro?

Cosari PitchLock Pro Detail

Readable in Daylight

The high-contrast full-color LED lights itself, so it stays clear on a sunny patio or under a stage wash where LCD screens fade.

Locks Low Notes Cleanly

Reads down to 27.5 Hz, so Drop D, baritone tunings and 5-string bass low B lock in without flutter.

No More Coin Batteries

No more CR2032 cells dying in your case, and no loose button batteries rolling around the house near kids or pets.

Cosari PitchLock Pro vs. Ordinary Alternatives

Cosari PitchLock ProStandard Competitors

FeatureCosari PitchLock ProStandard Competitors
PowerBuilt-in USB-C battery, 12 hours per chargeCR2032 coin cells replaced every few weeks
5-string bass low BLocks in about half a secondJumps between notes or needs a harmonic
Midday sunFull-color LED stays readableLCD screen fades and needs shading
Clamp and hingeSteel spring, dual-axis swivel, silicone padsPlastic ball joint, rubber pads that can mark nitro
Price$24.99 today$30 to $75 for comparable features
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What's Included

In the Box
  • 1 × Cosari PitchLock Pro 360° Clip-On Tuner
  • 1 × Braided USB-C Charging Cable
  • 1 × Quick-Start Card
Technical Specifications
  • Accuracy: ±0.5 cent
  • Detection Range: 27.5 Hz (A0) to 4,186 Hz (C8)
  • Response Time: 0.04 seconds
  • Modes: Chromatic, Guitar, Bass, Ukulele, Violin
  • Calibration: A4 430–450 Hz in 1 Hz steps
  • Battery: 12-hour runtime, 55-minute USB-C charge, 3-minute auto-sleep
  • Clamp: 32 mm max opening, silicone pads, 360° dual-axis swivel
  • Weight: 38 g
Care & Safety
  • Wipe the screen and silicone pads with a dry microfiber cloth. Skip solvents and guitar polish on the pads, since they can leave a film that reduces grip.
  • For long-term storage, charge to about half and top up every couple of months. Keep it out of hot cars and direct heat to protect the lithium battery.
  • Backed by our 30-Day Money-Back Guarantee & 2-Year Warranty
  • Customer Support: support@buycosari.com
In the Box Cosari PitchLock Pro

In Tune in Three Steps

Swipe left for steps 2 and 3

  1. Clip It On
    1

    Clip It On

    Squeeze the rear paddles and clamp the padded jaw onto the top edge of your headstock.

  2. Pick a Mode and Aim
    2

    Pick a Mode and Aim

    Press the side button to choose your instrument mode, then swivel the screen toward your eyes.

  3. Pluck Until It's Green
    3

    Pluck Until It's Green

    Pluck each string and turn the peg until the center bar glows green. Six strings take about 20 seconds.

Verified Customer Reviews

What 200+ Verified Buyers Say About the Cosari PitchLock Pro

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4.8
Based on 247 verified reviews
5 Stars
212
4 Stars
25
3 Stars
7
2 Stars
2
1 Star
1
97% of buyers recommend the Cosari PitchLock Pro
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Marcus Vance2 days ago

Finally retired my graveyard of broken Snarks

I've bought four Snarks in three years and every single one either snapped at the plastic ball joint or died right before rehearsal because the CR2032 battery drained in my gig bag. Clipped the PitchLock Pro onto my Martin dreadnought and couldn't believe how fast it locked onto the low E and Drop D—zero jumping needle, just dead-center green. Plus the pure silicone pads don't worry me on my nitro finish.

Verified Purchase · Austin, TX · Cosari PitchLock Pro

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Dave K.4 days ago

Locks onto a 5-string bass low B in half a second

Most clip-on tuners completely choke below the E string on a bass. What shocked me most is how fast this locks onto the low B string on my 5-string Fender—zero flutter, just dead-center green in half a second. Being able to top it off with the exact same USB-C cord sitting on my desk for my iPad is the upgrade I didn't know I needed.

Verified Purchase · Nashville, TN · Cosari PitchLock Pro

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Evan Lindqvist1 week ago

Actually readable at an afternoon patio gig

Played an outdoor afternoon patio gig last Saturday where my old D'Addario tuner screen completely washed out in the sun. The display on this Cosari looks like a miniature OLED smartwatch screen. You can read the green and amber bars from three feet away in direct daylight without twisting your neck.

Verified Purchase · Denver, CO · Cosari PitchLock Pro

✓ Verified Purchase
Sarah Jenkins1 week ago

No more hunting for coin batteries at 9 PM

I only get 30 minutes to practice after my kids go to sleep, and spending half of that digging through kitchen drawers for a CR2032 battery was infuriating. I charged this once via USB-C three weeks ago and the battery indicator hasn't even dropped a bar. The auto-off after three minutes saves me every time.

Verified Purchase · Portland, OR · Cosari PitchLock Pro

✓ Verified Purchase
Chris M.2 weeks ago

Safe on nitrocellulose lacquer and built tough

Never leave a cheap rubber clip-on on a Gibson headstock—plasticizers in cheap rubber will literally burn into nitrocellulose lacquer. I tested the silicone pads on my Les Paul and there's zero chemical smell or residue. The spring clamp has real tension and doesn't flop upside down when I dig into chords.

Verified Purchase · Chicago, IL · Cosari PitchLock Pro

✓ Verified Purchase
T. Gallagher2 weeks ago

Way faster for daily playing than my strobe tuner

I own a $75 Peterson StroboClip for doing bridge intonation setups, but the spinning display takes forever to settle for quick couch playing. The Cosari locks on immediately and matches my pedalboard tuner down to the cent. Only docking half a star because I wish the included USB-C cable was a little longer, though any phone cord works.

Verified Purchase · Seattle, WA · Cosari PitchLock Pro

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Hannah Ross3 weeks ago

Works seamlessly across violin, uke, and acoustic

I teach private lessons out of my living room and used to rely on a phone app until someone coughed or talked while a student was tuning. Since this reads pure headstock vibration, the room can be chaotic and it still nails the pitch. Switching between Violin, Ukulele, and Chromatic modes takes one button tap.

Verified Purchase · Minneapolis, MN · Cosari PitchLock Pro

✓ Verified Purchase
Greg P.3 weeks ago

Bought three so I never have to swap tuners

With the 50% off deal I grabbed three of them so I can leave one permanently clipped on my acoustic, my Strat, and my P-Bass. The 360-degree swivel is stiff enough to stay exactly where you point it, even tucked behind a Telecaster headstock.

Verified Purchase · Phoenix, AZ · Cosari PitchLock Pro

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Liam O'Connor1 month ago

Zero noise bleed in loud rehearsal rooms

Our drummer never stops playing during practice, which makes tuning by ear or with a mic impossible. The piezo pickup inside this clamp isolates the neck vibration so cleanly that I can drop-tune between songs while the whole band is making noise.

Verified Purchase · Boston, MA · Cosari PitchLock Pro

✓ Verified Purchase
Rebecca D.1 month ago

Solid hinge, zero rattle on the headstock

My biggest complaint with clip-on tuners is when the plastic hinge gets loose after a month and buzzes sympathetically when you hit an open G. This one feels dense, clamps tight with thick silicone cushions, and stays dead silent on my Taylor.

Verified Purchase · Raleigh, NC · Cosari PitchLock Pro

Your Next Practice Session Starts in Tune.

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Frequently Asked Questions

Is the clamp safe for nitrocellulose finishes on Gibson, Martin and vintage Fender guitars?

Yes. The pads are inert medical-grade silicone with no plasticizers. We left it clamped to a nitro lacquer panel for 72 hours and found no marks, haze or residue.

Will it read Drop D, baritone guitar and a 5-string bass low B?

Yes. It reads down to 27.5 Hz (A0). In our tests it locked the bass low B (30.87 Hz) in about half a second without flickering between notes.

Can I tune in a loud room with other instruments playing?

Yes. The piezo sensor reads vibration through the headstock, not sound through the air. It stayed accurate with an 85 dB backing track playing in the same room.

Can I change the reference pitch to 432 Hz or 442 Hz?

Yes. A4 calibration adjusts in 1 Hz steps from 430 Hz to 450 Hz, and the tuner remembers your setting after it powers off.

What happens if I forget to turn it off?

It goes to sleep automatically after 3 minutes without a signal, so leaving it on the headstock overnight barely touches the battery.

How does it charge and how long does it last?

It charges over USB-C with the included cable or any USB-C to USB-A/C cable. A full charge takes about 55 minutes and gives around 12 hours of continuous tuning.

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