Kirstein Ruler Tool for String Instruments String Action Ruler

A Must-Have for Guitarists & Co.!
  • Practical tool in credit card format
  • Suitable for string instruments like guitar, bass, ukulele, banjo, etc.
  • Adjust string height, pickup height, string spacing, and more
  • Also for measuring the depth of nut slots or fret slots
  • Millimeter scale with 0.5 mm increments and inch scale
4,89
All prices include VAT
Ready for shipping

Standard Shipping
3,90
Delivery time 1 - 2 working days
Free shipping from €29
Priority Shipping
+ 0,99
Shipping on 20.05.2026
Express Shipping
+ 5,90
Delivery on Thursday, 21.05.2026, if you order within  13 Hrs. 15 Min. 
Shipping and Delivery

The Universal Ruler Tool - Fits in Every Wallet!

With the Kirstein ruler tool for string instruments, you always have full control over the string action of your instrument. Whether guitar, bass, ukulele, banjo... this handy card is suitable for any string instrument and can be carried in any wallet thanks to its credit card format, even when you're on the go. All scales and markings are given in both millimeters and inches. The vertical scales allow easy measurement of the depth of nut slots and fret slots or the height of pickups.

Easy String Height Adjustment

To adjust the string height, simply place the card at the 12th fret of your guitar and see at a glance from the markings whether you need to raise or lower the setup. Recommendations for various string instruments are listed on the back of the card.

Recommendations for Various String Instruments - String Height at the 12th Fret

Instrument6th String1st String
Electric Guitar Low1.5 to 2.0 mm1.0 to 1.5 mm
Electric Guitar High2.0 to 2.5 mm1.5 to 2.0 mm
Western Guitar Low2.5 to 3.0 mm2.0 to 2.5 mm
Western Guitar High3.0 to 3.5 mm2.5 to 3.0 mm
Classical Guitar3.5 to 4.0 mm3.0 to 3.5 mm
Bass Guitar3.0 to 3.5 mm2.8 to 3.3 mm

Features

  • practical tool in credit card format
  • Suitable for string instruments like guitar, bass, ukulele, banjo, etc.
  • Adjust string height, pickup height, string spacing, and more
  • Also for measuring the depth of nut slots or fret slots
  • Millimeter scale with 0.5 mm increments and inch scale
  • Material: plastic
  • Dimensions: 86 x 54 mm

Scope of delivery

  • 1 x Kirstein Ruler Tool for String Instruments

Specification

  • Product number 00042806
  • Colour Yellow

Reviews

4.5/5.0
Based On 15 ratings
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A verification of the ratings has taken place as follows: Only customers who are registered in our online store and have actually purchased the product from us can submit a rating for the item in the customer account.

Useful utensil
Review from Joachim on 29.12.2020
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 verified purchase
Easy to use and read. Very handy because credit card format. Useful because also information in inches.
For the bit of plastic actually overpriced, but something better geschwige because cheaper I have not found anywhere else.
Ruler for instrument settings
Review from Matthias on 25.12.2020
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 verified purchase
Ruler tool in credit card format. Does what it is meant to do.
Good teaching
Review from Gerald on 25.10.2020
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 verified purchase
Good gauge, but plastic. Does not matter, but metal would have been nice.
A very good tool
Review from Heinz on 23.06.2020
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 verified purchase
To adjust the neck curvature and the string action, this small ruler is really highly recommended. The format has the size of a check card and is very handy and easy to read, although a bit expensive. What surprised me, however, is the fact that it was sent in a box the size of half a shoebox with a parcel service, a small letter would have been quite sufficient. What is this nonsense, you can be glad that it is not a Euro pallet, because I do not have a forklift in the house. Nevertheless, also because of the annoying waiting time for the DPD parcel carrier, I would want to buy the tool again and again, because it is good and usable.
Great help
Review from Anonymus on 11.03.2020
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 verified purchase
Does what it's supposed to, it's just a check card, but advantage to it is that it doesn't scratch anything.

Questions about product

Your question about the article Kirstein Ruler Tool for String Instruments String Action Ruler

Your question will be forwarded directly to the department and answered as soon as possible.

Question by Peter winkler on 30.01.2021

You could have made a video: How to use the Rock N Ruler when setting up an electric guitar and acoustic guitar:

Answer by Musikhaus Kirstein:

There is no special video for this product, but we have a small tutorial on how to adjust the string action correctly: https://www.youtube.com/watch?v=GQTpcSK1IRw

Your contact persons

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