is plastic with plastic gears. it is not a perfect metrology class device. annoying that it doesn't track the square. What I like to do is put a line against a direct link and then use this tool to move that line to where I really need it. However, the horizontal translation isn't exactly square, so it turns out my link is just a guess. we're talking about 1*, maybe 0.5*, so I don't mean bad, but it might not be what you're looking for. rotation around the z-axis is particularly useful, and the laser's self-alignment compensates for any wobbling this tool has as it rotates. Probably deserves 5 stars because what do you expect. and if you had an xyza widget that accurate, it wouldn't be useful in a construction scenario. but I still give 4 stars.
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