is this chromatic? Can I set the tuner to other than 440?

Yes, chromatic. Calibration range from 410-480 Hz.

Is it auto calibration for each string?

I take it you're asking whether it auto-detects the pitch for each string, rather than the user having manually to select it for each string. Yes! It's really simple to use.

Is it safe to leave in a guitar with nitrocellulose finish?

I have had it in my Taylor for 10 months and just removed it to move it to another guitar. No issues with it affecting the finish. As with most anything that can attach to your guitar. Know what finish was used on it, guitars with nitro-cellulose finishes may show damage from the rubber pad on this tuner. I don't leave anything physically attached to my Martin.

what are the dimensions of this tuner? I need to check if it can fit with the sound board bracing of my Aoud before buying it. Thanks

This hits the bracing in one of my guitars. But this tuner is so tiny, just move it along the sound hole until you find a better fit. On a flat top guitar, this'll work wherever you place it around the rim of the sound hole. Your sound hole is 360 degrees. Just find a spot where it doesn't hit any bracing and you have a good line-of-sight to the display.

Daddario Ns Micro Soundhole Tuner Discreet Chromatic Acoustic Guitar

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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174.97 DT

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Description

🎸 Tune like a pro, stay in the groove—hidden, hassle-free, and always ready.

NON MARRING CLIP - Secure, stress-free installation with a clip that protects your instrument’s finish—no scratches, no worries.
INVISIBLE PRECISION - Discreetly fits inside your soundhole for seamless tuning without altering your guitar’s aesthetic.
TUNE ANYTIME ANYWHERE - Bright color screen ensures perfect visibility even on dimly lit stages or late-night sessions.
MUSICIAN TRUSTED QUALITY - From D’Addario, a brand with 20+ years of innovation, ensuring reliability and professional-grade performance.
VIBRATION BASED ACCURACY - Piezo transducer picks up instrument vibrations, delivering ultra-precise tuning without ambient noise interference.

The D'Addario NS Micro Soundhole Tuner is a compact, chromatic tuner designed specifically for acoustic guitars and similar instruments. It features an ultra-accurate piezo transducer that senses vibrations directly from the soundboard, a bright multi-color display for easy reading in any lighting, and a non-marring clip that fits discreetly inside the soundhole. Trusted by musicians worldwide, it offers quick, silent, and precise tuning without compromising your instrument’s look or tone.

Specifications

ASIN	B018K9K034
Batteries	1 CR2 batteries required. (included)
Battery type	Lithium Ion
Best Sellers Rank	#1,169 in Musical Instruments ( See Top 100 in Musical Instruments ) #23 in Music Tuning Accessories
Body Material	Synthetic
Color Name	Original Version
Customer Reviews	4.5 4.5 out of 5 stars (3,568)
Date First Available	December 1, 2015
Item Weight	0.007 ounces
Item model number	PW-CT-15
Material Type	Synthetic
Product Dimensions	3 x 1.13 x 4.63 inches
Size	Pack 1
Standing screen display size	3

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