Does this tuner show sharps of flats, ie if i wanna tune 1/2step lower will this tuner display Eb or D# or does it only show standard tuning,

Yes, it will show a D#. It is what is known as a 'chromatic tuner'. It detects vibrations, computes the frequency and shows whichever note you are closest to. It can, therefore, tune pretty much any instrument. It is a wonderful piece of kit. I have 3 or 4 of them.

Can you tell me if the display is changeable from 'Landscape' to 'Portrait' as it seems to me that the display will never be upright?

The display has four orientations 2 in portrait (at 180 degrees to each other) and 2 in landscape (again at 180 degrees to each other).

Will this tuner cover Banjo, Guitar, Uke / Banjolele, Dulcimer. I Currently use Korg & CellPhone, background noise is PROBLEM. Herz Limits Please?

I believe it will cover all the instruments listed. It relies on picking up vibration directly from the Headstock and does not appear to be influenced by extraneous noise. No idea what the hertz range is but I doubt if that is relevant as long as it covers your audible hearing range!!!!! (By the way sharps are covered)

Ok, I'll rephrase the question. Has anyone used this tuner with a 12 string acoustic guitar? If so, how did it perform?

Just seen your question. I don't have a 12-string acoustic anymore, but it works perfectly well with an acoustic and also with my Rickenbacker 620/12 electric 12-string. As long as you only strike one string at a time it should function prefectly well, as it reads the vibration rate from being clipped to the headstock. An acoustic will have very good resonance, so the tuner reads the vibration rate clearly and easily. Hope that helps.

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🎸 Tune like a pro, stay stealthy, and never miss a beat!

READY WHEN YOU ARE - Compact, lightweight design stays on your instrument even in its case—always ready to keep you in tune.
COLOR CODED CLARITY - Tri-color backlit display instantly shows tuning status—red, yellow, or green—for quick, stress-free adjustments.
INVISIBLE PRECISION - Stealthy micro clip-on tuner blends seamlessly behind your headstock—tune discreetly, perform confidently.
UNIVERSAL FIT FLEX - Adjustable padded clamp and 360° swivel make it perfect for any stringed instrument, left or right-handed.
VIBRATION DRIVEN ACCURACY - Piezo transducer picks up string vibrations, not ambient noise, ensuring flawless tuning every time.

The D'Addario PW-CT-12 NS Micro Headstock Tuner is a compact, ultra-precise clip-on tuner featuring a vibration-sensitive piezo transducer and a tri-color backlit display. Its stealthy design fits discreetly behind any stringed instrument’s headstock, with a 360-degree swivel and adjustable clamp for versatile positioning. Powered by an included CR2032 battery with auto-off for extended life, it’s the perfect tuner for professionals and enthusiasts who demand accuracy and convenience.

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Product Dimensions	2.54 x 0.18 x 2.54 cm; 9.07 g
Batteries	1 CR123A batteries required. (included)
Item model number	PW-CT-12
Body Material	Lithium
Colour	Mehrfarbig
Connector	clamp
Material Type	‎Lithium
Country Produced In	china
Size	Single Pack
Item Weight	9.07 g

D'AddarioPW-CT-12 NS Micro Headstock Tuner

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