GEWA CT-30 – chromatic tuner for guitar, bass, violin, and other musical instruments GEWA CT-30 is a universal electronic chromatic tuner that enables precise tuning of a wide range of musical instruments. Thanks to built-in microphone, 6.3 mm Jack input, automatic and manual tuning modes it is suitable for guitarists, bassists, violinists, mandolin players, and other musicians. The tuner offers accuracy ±0.5 cent, adjustable calibration range 433–447 Hz and a wide range of tone recognition from A0 (27.5 Hz) to C8 (4186 Hz)The Flat Tuning function is also included, allowing tuning up to four semitones lower. Thanks to the clear LCD display with analog pointer indicator and three auxiliary LED indicators The GEWA CT-30 provides clear visual feedback when tuning. Its compact size makes it easy to carry in a guitar case, gig bag, or accessory pouch. Chromatic tuner for a wide range of musical instruments GEWA CT-30 it uses chromatic tuning, allowing it to recognize individual notes of the chromatic scale. Thanks to this, it is not limited to standard tuning for just one group of musical instruments. In addition to the universal chromatic mode, it offers specialized settings for guitar, bass, and violin, which can also be used when tuning a mandolin. Chromatic mode – universal tuning of musical instruments within the supported frequency range. Guitar – also suitable for seven-string guitars. Bass guitar – supports four-string, five-string, and six-string bass guitars. Violin and Mandolin – a mode suitable for tuning string and other stringed instruments. Thanks to its universal character, the tuner is suitable for home use, music schools, rehearsal rooms, as well as for musicians who play multiple instruments. Two recording methods – microphone and Jack input One of the most practical features of the tuner GEWA CT-30 there is the option of tuning using the built-in microphone or direct wired connection. Integrated microphone The built-in microphone allows you to tune acoustic musical instruments without the need for any additional accessories. Simply place the tuner near the instrument, play a note, and follow the indication on the display. This method is suitable, for example, for tuning acoustic guitars, violins, mandolins, and other instruments that produce a sufficiently clear acoustic tone. Jack 6.3 mm input An electric guitar or bass guitar can be connected directly to the tuner using a standard instrument cable with a 6.3 mm jack connector. Direct connection is especially practical in noisier environments, as the tuner processes the instrument's electrical signal independently of surrounding acoustic noise. The Jack input can also be used with electroacoustic instruments equipped with a suitable pickup and output. Automatic and manual tuning GEWA CT-30 offers both automatic and manual tone recognition methods. In automatic mode, the tuner identifies the played note and displays its pitch along with the deviation from correct tuning. This method is quick and convenient for regular tuning. Manual mode allows you to work with the selected tone according to the capabilities of the specific tuner mode. It is useful for precise tuning control and when working with individual strings. LCD display with analog pointer and three LED indicators The tuner is equipped with LCD display with dimensions 46 × 21 mmwhich uses a clear analog tuning indicator. The display shows the deviation from the desired pitch. This allows the musician to easily see whether the string needs to be tightened or loosened. Tuning is also assisted by three additional LED indicators, which provide additional visual indication during fine-tuning. The combination of a display and LED indicators allows for easy navigation even for less experienced musicians. Accuracy ±0.5 cent – precise tuning The manufacturer GEWA states for the CT-30 model tuning accuracy ±0.5 cent, which represents a very fine resolution of musical pitch. A cent is a unit used to express small differences between musical tones. One semitone in equal temperament tuning consists of 100 cents. Accurate tuning is important not only when playing solo, but also during band rehearsals, recording sessions, or when playing together with other musical instruments. Adjustable calibration 433–447 Hz GEWA CT-30 allows you to set the reference frequency of the A4 tone within a range 433 to 447 HzThere is no text to translate. The default value is A4 = 440 Hz, but when playing together with an orchestra, chamber ensemble, or other instruments, it may be necessary to adjust the tuning to a different reference frequency. Adjustable calibration therefore expands the possibilities of using the tuner beyond regular home practice. Flat Tuning – detuning by up to four semitones Function Flat Tuning allows you to adjust the tuning by up to four semitones lower compared to standard tuning. It is especially useful for guitarists and bassists who use lower tunings in rock, metal, blues, or other musical styles. Supported tunings include transposed tunings one, two, three, or four semitones lower. For non-standard intervals between individual strings, the chromatic mode can be used. Tuning range A0–C8 The GEWA CT-30 features a wide tone recognition range from A0 (27.5 Hz) up to C8 (4186 Hz). This range covers both very low and high musical tones, allowing you to tune a wide variety of stringed and other musical instruments. When tuning acoustically, the reliability of tone recognition also depends on the instrument's volume, the purity of the played note, and the surrounding noise. Compact dimensions and matte black finish Electronic tuner GEWA CT-30 has dimensions of only 88 × 56 × 20 mm and a weight of approximately 100 gramsThere is no text to translate. Thanks to its compact design, it easily fits into a guitar case, instrument bag, or accessory pocket. The matte black finish gives it a discreet and professional look. The tuner is suitable for everyday use at home, in music school, and at concerts. Powered by two AAA batteries GEWA CT-30 is powered with two AAA batteries with a voltage of 1.5 V, which are included in the package. There is no need to purchase an external power adapter. Thanks to commonly available AAA batteries, you can easily restore power even while traveling or performing at concerts. Technical specifications ParameterValue BrandGEWA ModelCT-30 Product typeElectronic Chromatic Tuner DesignPocket tuner PurposeGuitar, bass guitar, violin, mandolin, and other musical instruments Guitar supportIncluding a 7-string guitar Bass guitar supportIncluding 5- and 6-string bass guitars ModesChromatic, guitar, bass guitar, violin/mandolin Tone recognitionAutomatic / manual Sound recordingIntegrated microphone InputJack 6.3 mm DisplayLCD with analog pointer indicator Display dimensions46 × 21 mm LED indication3 auxiliary LED indicators Accuracy±0.5 cents Calibration433–447 Hz Tuning rangeA0 (27.5 Hz) – C8 (4186 Hz) Flat TuningUp to 4 semitones lower Power supply2 × AAA 1.5 V Batteries includedYes Dimensions88 × 56 × 20 mm WeightApproximately 100 g ColorMatte black Manufacturer code902.102 EAN4046662046020 Packaging1 × GEWA CT-30 tuner, 2 × AAA batteries GEWA – Tradition of German Musical Accessories Since 1925 GEWA is one of the traditional European brands of musical instruments and accessories. The company's history dates back to 1925when Georg Walther founded the company in the Vogtland region of Germany, an area renowned for its long tradition of musical instrument manufacturing. Over the following decades, GEWA developed into an international supplier of musical instruments, cases, stands, strings, tuners, and other accessories. The brand's range includes products for guitarists, string players, drummers, wind instrument players, and other musicians. GEWA places emphasis on practical functionality, reliability, and the accessibility of musical equipment. Model GEWA CT-30 is an example of universal accessory that combines precise measurement, wide compatibility, and easy operation. Why choose the GEWA CT-30 tuner? Universal chromatic tuner for a wide range of musical instruments. Suitable for guitar, bass guitar, violin, and mandolin. Support for 7-string guitars and 5- or 6-string bass guitars. Integrated microphone for tuning acoustic instruments. 6.3 mm jack input for direct connection of electric instruments. Automatic and manual tone recognition. Tuning accuracy ±0.5 cent. Adjustable calibration 433–447 Hz. Flat Tuning down to four semitones lower. Wide recognition range A0–C8. LCD display with analog pointer. Three additional LED indicators for fine-tuning. Compact dimensions and matte black finish. Two AAA batteries are included in the package. Frequently Asked Questions (FAQ) For which musical instruments is the GEWA CT-30 suitable? The tuner is suitable for acoustic and electric guitars, bass guitars, violins, mandolins, and other instruments within the supported tuning range. Is the GEWA CT-30 a chromatic tuner? Yes. The chromatic mode allows for the recognition of individual musical notes and can also be used with alternative tunings. Does the tuner work without being connected by a cable? Yes. The built-in microphone allows you to tune acoustic musical instruments without a cable. Can I connect an electric guitar directly to the tuner? Yes. The GEWA CT-30 has a 6.3 mm jack input, which allows you to connect an electric guitar or bass directly using a suitable instrument cable. Does the GEWA CT-30 also support seven-string guitars? Yes. The manufacturer states support for seven-string guitars as well as five-string and six-string bass guitars. What does the Flat Tuning function mean? Flat Tuning allows tuning down by up to four semitones. This feature is ideal for guitarists who use lower tunings. What is the accuracy of the GEWA CT-30 tuner? The manufacturer specifies an accuracy of ±0.5 cents, which allows for very precise fine-tuning of musical notes. Is it possible to change the reference tuning frequency? Yes. The GEWA CT-30 allows calibration adjustment in the range of 433–447 Hz. The standard reference frequency is A4 = 440 Hz. What batteries does the GEWA CT-30 use? The tuner uses two AAA batteries with a voltage of 1.5 V, which are included in the package. What is the difference between the GEWA CT-30 and clip-on tuners? GEWA CT-30 is a standalone pocket tuner with a built-in microphone and a Jack input. Clip-on tuners attach directly to the instrument and detect its vibrations. Therefore, the CT-30 is also suitable for players who prefer direct cable connection or universal tuning using the microphone. GEWA CT-30 – universal tuner for everyday use GEWA CT-30 is a precise and practical chromatic tuner that offers a wide tuning range, both automatic and manual modes, adjustable calibration, and the ability to tune down by up to four semitones. Thanks to the combination of an integrated microphone, a Jack input, and a clear LCD display, it is suitable for both beginner and advanced musicians. It offers a practical solution for tuning guitars, bass guitars, violins, mandolins, and other instruments at home, in music schools, rehearsal rooms, and on stage.