This slider ruler product deserves a standing ovation. I’m an ex-guitarist from decades past and am relearning the fundamentals of music theory and finger work through the pentatonic major and minor scales, modes, notes, and fretboard. This ruler shows in vivid Technicolor detail the scale shapes and notes, making them easy to understand, learn, and transpose to every key. Running through the scales both individually and linked to each other up and down the neck is now a blast. Also marked are optional off-scale notes that can add to the basic shapes. The ruler should last for years, is high-quality, very portable, a dream to read, logical, durable, and comes with an excellent operation and example sheet that explains and enhances the operation with diagrams and best practices recommendations. The email product support is excellent, too. Well worth the money, highly recommended. And very cool.

Excellent, A++ learning tool for pentatonic scales, diatonic and minor scales, blues scales, and all seven modes. If you learn these five shapes backward and forward and inside-out (each shape is a different color on the slide rule), you will be the master of your fretboard. I bought it primarily to help me unravel the Mystery of the Modes — I’ve tried several different ways to do this, but none of them are as visual, clear, and simple as this slide rule.

I love this product! I even bought one as a gift to help a beloved, starving artist friend. Turns out it’s the gift that keeps on giving, because he’s able to explain and share his lifetime of musical knowledge right over the long-distance lines, with The Sliding Ruler as a common visual reference for me to understand. Brilliant!

This is an amazing tool. It works perfectly the David Wallimann guitar course. I have a stack of paper from the course covering everything you see on this tool. Here, its all in one easy to use tool. If you are taking his course here is your cheat sheet.

Great learning tool. Also good for bands that write music together if you need a quick tool to communicate modes.

The slide ruler is a helpful tool for guitarists both as beginners and advanced to quickly visualize the fretboard on the guitar.

Awesome tool. A must have while learning pentatonic scales. Replaces all the sheets of paper scattered everywhere.

This is the perfect tool when practicing some guitar scales.  I love this thing!