XtremeAmazing 9Pcs Understring Radius Gauge Luthier Tools and 4Pcs Guitar Notched Radius Gauge with String Action Ruler Gauge Set Stainless Steel Guitar Fingerboard Fretboard Measuring Tool

Would recommend , dont spend more money for a name brand, this works great

These have been of great use when setting up my guitars. My only complaint would be that the metal is a little thin, but these are really good for the price.

These are what they advertise. Already owned a more pricey action ruler and this is equal to it. Used the radius gauges to do 2 nuts. Pretty much everything you need to measure for basic setup if your bridge saddle has adjustable height per string or if you want to replace a nut.

Luckily I had a guitar laying around and these seem to work great for that!

The set of of T-shaped measuring pieces, does not seem to have a 16-inch radius unit, which is the one I most need. Otherwise, it’s fine.

They seem to match all my different size guitar necks, so happy. I only dropped 1 star because, you can see in pic, that they're a bit flimsy and not real flat. However they seem fine and measured properly to manufacturer specs, so happy. I'm not a luthier but have several guitars, both acoustic and electric so these will really help. Good deal all around. Fast delivery and packaged well.

The gauges are completely off. The 7.25 is closer to a 12. Also the narrow and wide spacing gauges are even more off from each other. The 9.5 on one matches the 12 on the other. They gauges are not usable.

These are useful for finding the radius of your guitar neck.