The tool seems to be precise, well within specs and the idea of having 3 in 1 is brilliant. What i didn't like is that the edges of the notched sides are very sharp and can injure the fretboard easily, even when you are careful enough and experienced. I have been working as a guitar technician for more than 20 years and i didn't like it when i saw the fretboard scratched just by touching the notched side on it to make measurements with a filler. Nothing serious that I couldn't fix, but still my opinion is that it should be more refined in the edges of the notched sides. That said, I understand that production of such a ruler with that kind of attention to detail would have to cost triple the money but that doesn't mean I wouldn't buy it....I would definitely do! All in all, it's a good tool for hobbyists or for making measurements in your guitar, but not for professional work!
