Wish I had this earlier. This tool makes it so much faster and easier to get the proper slot height. Before this tool I had to measure and mark and put the string back in the slot and Che k the height. Now I just file and use the nut slot guage and when I am done I put the string in the slot and move on. Such a simple yet effective tool that makes one of my least favorite tasks much less aggravating.

This simple, straight forward tool will quickly and easily alert you to string slots that are cut too deep or high into the nut which, when corrected, substantially improves the feel, playability and tone of your guitar. My experience is a little filing goes a long way towards perfecting String action at the first fret and will then be much improved across the entire neck. So far, majority of guitars that I have e adjusted were cut too high and needed lowering by at least .008’’.
Watch Joe’s instructional video, understand the use of the tool, then get to it! You will wish you had this tool since you have been setting up guitars. Brilliant idea and works as advertised. Happy slotting (or salvaging) with the pleasure derived from mastering this essential set-up procedure.

Great Consistent Tool that's well worth the money.

5 STARS!!!
Buy it!

Simple yet elegant design.
Makes the job so much easier and quicker.
Get a bunch, use em and give some away as gifts. Your friends will thank you.

This little device -- a rectangle of stiff plastic with precise taper on three corners-- measures the elevation of the nut slot relative to the first fret with consistent accuracy. Unlike fancier and more complicated tools, you can check ten times and get the same result every time, making the process of cutting not slots much faster and much less nerve-wracking. If you have trained your ear to judge nut height by string tapping you might still want one of these for the last thousandth of an inch. Measures differentials of 0,3,5,and 8 thousandths.