I have never bought a bespoke ''fret rocker'. About 40 years ago, I started using a 6" stainless steel ruler that I just happened to have, and it has served me well. To find a high fret, just place the ruler on the first few frets, and slide it toward the bridge. If it bumps against a fret, it is high. Move the ruler on down so that it just catches the fret on the nut side of the high one. If it rocks, you have confirmed the high fret. Conversely, low frets can be identified by pressing on the end of the ruler and seeing if it rocks, all while sliding it toward the bridge. The reason for sliding the ruler in that direction is because buzzing often occurs on the next fret, due to a lack of next fret clearance.
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