KORG CS100-SH Sledgehammer Custom Clip-On Tuner



Using the unit in the following locations can result in a malfunction.

  • In direct sunlight.
  • Locations of extreme temperature or humidity.
  • Excessively dusty or dirty locations.
  • Locations of excessive vibration.
  • Close to magnetic fields.

Power supply
Be sure to turn off the power when the unit is not in use. Remove the battery in order to prevent it from leaking when the unit is not in use for extended periods.

Interference with other electrical devices
Radios and televisions placed nearby may experience reception interference. Operate this unit at a suitable distance from radios and televisions.

To avoid breakage, do not apply excessive force to the switches or controls.

If the exterior becomes dirty, wipe it with a clean, dry cloth. Do not use liquid clean-ers such as benzene or thinner, or cleaning compounds or flammable polishes.

Keep this manual
After reading this manual, please keep it for later reference.

Keeping foreign matter out of your equipment
Never set any container with liquid in it near this equipment. If liquid gets into the equipment, it could cause a breakdown, fire, or electrical shock. Be careful not to let metal objects get into the equipment.



NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

  • Reorient or relocate the receiving antenna.
  • Increase the separation between the equipment and receiver.
  • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
  • Consult the dealer or an experienced radio/TV technician for help.

If items such as cables are included with this equipment, you must use those included items. Unauthorized changes or modification to this system can void the user’s authority to operate this equipment.

Notice regarding disposal (EU only)
If this symbol is shown on the product, manual, battery, or package, you must dispose of it in the correct manner to avoid harm to human health or damage to the environment. Contact your local adminis-trative body for details on the correct disposal method. If the battery contains heavy metals in excess of the regulated amount, a chem-ical symbol is displayed below the symbol on the battery or battery package.

This product has been manufactured according to strict specifications and voltage requirements that are applicable in the country in which it is intended that this product should be used. If you have purchased this product via the internet, through mail order, and/or via a telephone sale, you must verify that this product is intended to be used in the country in which you reside.

WARNING: Use of this product in any country other than that for which it is intended could be dangerous and could invalidate the manufacturer’s or distributor’s warranty.
Please also retain your receipt as proof of purchase otherwise your product may be disqualified from the manufacturer’s or distributor’s warranty. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. CAN ICES-3 B / NMB-3 B. All product names and company names are the trademarks or registered trademarks of their respective owners.

Parts of the Sledgehammer Custom 100


Installing the battery

Make sure to turn the power off before you install or replace the battery. When it is time to replace the battery, the note name indicator will blink. Immediately replace the battery with a new one.


  1. Open the battery compartment cover on the rear of the tuner in the direction of the arrow.
  2. Insert the battery, making sure to observe the correct polarity, and then close the cover.


Tuning procedure

  1. Turn the left shuttle switch upward. Each time you turn the shuttle switch, the Sledgehammer Custom 100 will be turned on or off. If the power is left on for approximately 3 minutes without any user input, it will turn off automatically.
  2. If necessary, change the meter mode and calibration (reference pitch).
  3. Play a single note on your instrument. The note name closest to the detected pitch appears in the note name indicator. Tune your instrument to the correct pitch so that the desired note name appears on the display.
  4. Tune the instrument by playing a single note and checking the meter. The tuning indications differ depending on the selected meter mode setting. Even if the pitch is within the range of detection, it may not be possible to detect the pitch of an instrumental sound that contains large numbers of overtones or a sound that has a rapid decay.
    The meter may respond to vibrations it picks up from the environment; however, this will not affect tuning of the instrument.

Setting the meter mode (*M)
Each time you turn the left shuttle switch downward, the meter mode changes. A number indicating the meter mode appears in the note name indicator for a few seconds.
1 (Regular) → 2 (Strobe) → 3 (Half strobe) → 1 (Regular) …

Regular meter
Tune your instrument so that the center LED of the meter display is lit up. The LED illumination will move from the center toward the right if the note is sharp, or from the center toward the left if the note is flat.


Strobe meter
Tune your instrument so that the illumination stops flowing in the meter display. Since the strobe meter has higher precision, it allows you to tune with greater accuracy. The illumination will flow from left to right if the note is sharp, or from right to left if the note is flat.


Half-strobe meter 
Tune your instrument so that the stream stops and only the center LED is lit up. The right side of the meter display will strobe if the note is sharp, and the left side of the meter display will strobe if the note is flat. When the pitch is correct, only the center LED will light up.


Calibration (reference pitch) settings (*M)
Each time you turn the right shuttle switch upward (or downward), the calibration value (reference pitch) increases (or decreases) in 1 Hz steps. The last digit of the setting appears in the note name indicator for a few seconds. 6 (436Hz)… 9 (439Hz) 0 (440Hz) 1 (441Hz) 2 (442Hz) … 5 (445Hz) The setting range is between 436 and 445 Hz.

Attaching to the instrument and range of motion
The Sledgehammer Custom 100 tunes by picking up the vibrations of the instrument. Therefore, be sure to attach the Sledgehammer Custom 100 to the headstock of your instrument in order to tune it. In addition, the Sledge-hammer Custom 100 can be freely moved so that the display is easy to read.

  • The Sledgehammer Custom 100 may be damaged if you apply excessive force within its range of motion, or attempt to move it beyond its intended range of motion.KORG-CS100-SH-Sledgehammer-Custom-Clip-On-Tuner-FIG-6
  • Please carefully attach the Sledgehammer Custom 100 to your instrument. Leaving the Sledgehammer Custom 100 attached for a long time may damage or mark the instrument’s surface.
  • Depending on various factors such as age-related change or the surface finish, there is a possibility that your instrument may be damaged by attaching this product.

Shuttle lights (*M)

As a default, the shuttle lights are set to light up when no note is inputted for tuning and to go off while tuning. If you want the shuttle lights to remain off, hold the left shuttle switch turned upward for three seconds when you turn on the tuner. After the shuttle lights blink, they will go off. Repeat the procedure to return the shuttle lights to the setting where they light up when no note is inputted.


  • Scale: 12-note equal temperament
  • Range (sine wave): A0 (27.50 Hz)–C8 (4186 Hz)
  • Precision: +/-0.1 cent (Strobe meter)
  • Reference pitch: A4 = 436–445 Hz (1 Hz steps)
  • Dimensions: 64 mm (W) X 49 mm (D) X 66 mm (H) 2.52’’ (W) X 1.93’’ (D) X 2.60’’ (H)
  • Weight: 37 g/1.31 oz. (including battery)
  • Battery life: approximately 100 hours (tuner continuously operating, A4 input, when using alkaline battery)
  • Included items: Owner’s manual, One AAA battery

Settings are remembered even when the power is off.  Specifications and appearance are subject to change without notice for improvement

Documents / Resources

KORG CS100-SH Sledgehammer Custom Clip-On Tuner [pdf] Owner's Manual
CS100-SH Sledgehammer Custom Clip-On Tuner, CS100-SH, Sledgehammer Custom Clip-On Tuner, Clip-On Tuner, Tuner

Leave a comment

Your email address will not be published. Required fields are marked *