Abstract: A gauge for setting the trimmer blades of a vibratory hair trimmer comprising of a gauge block with a slot in it of the shape of a perfectly adjusted set of trimmer blades. One embodiment, the gauge block has a hole in the front that would line up with hole in the front of the trimmer blade set. A pin with a diameter slightly smaller is inserted into the hole and pushed up with the thumb. The pin cantilevers on the edge of the hole and forces the front blade down into the slot. The back blade is forced down with the forefinger as the adjustment screws are tightened. Another embodiment has a spring clipped to the front of the front blade of the blade set and forces it into the groove when the adjustment screws are tightened.