I was loosing my Zero point on my X-axis, so I bought the 800mm one based on the recommendations of others. I received this one in good shape and installed the scale with no problems but a little elongating of a mounting hole (my original scale 37.25" compared to this 37"). From a little testing, it seems to be functioning reliably. Other sites would charge $230+ for a glass scale with shipping. Huge savings over the other popular web site(s) for scales. When my other 2-axis give me problems, I plan to come back. Very satisfied so far, hope time and use do not prove otherwise.