Ouriel Ouaknine Sliding Ruler - Magic tool for the practice of PENTATONIC, DIATONIC and MODE scales/Pentatonic Sliding Ruler for Guitar: The essential tool for ALL Guitarists

I haven't used this a ton yet but it is laid out really nice and is completely understandable

this is a fantastic tool for practicing scales , once you understand how it works it’s so useful

This useful guide measures only 11" x 3" and has the five major pentatonic scale shapes and notes colour coded on one side, and the five minor (similar) shapes and notes colour coded on the other side. Though the major and minor shapes are the same, the root note changes. Very easy to read and the scale root can be set to any note on the major or minor side. Set note G as the root on the major shape side, and note E automatically appears as the root on the minor shape side. The five colour coded shapes are very clear and easy to follow. Also indicated are the missing notes to make the diatonic scale in any key, the minor 3rd in each key for the "blue" note, the seven modes, and the notes shared between scale shapes. Much more convenient than having to fumble through a book. You can practice with this on your lap with all the necessary info in front of you. My only gripe is that the enclosed instructions are not the easiest to follow, though once sorted out, the shape guide is very easy to use. Very clever and useful. Probably a wee bit expensive, but it certainly works.

I watched a number of videos online about this product, and to be honest- I can’t complain. It does what it says it will do, and at 58, my eyesight requires reading glasses. I have no issues with this product as some people have mentioned.

Nicely made High quality I love it ..the only down side is it dose not come with some kind of standSo I find it hard to practice 'but overall I Highly recommend..I would like to thank the people who made this Guitar product .Thank youChris