I ordered this DRO after watching many YouTube videos of folks that have bought the same or similar. It works exactly as it says it will, as backed up by indicators and micrometers in my shop. There is a process to dial in error. In my case, there wasn't any worth messing with. If you want it balls on to the tenth ... you can make those calibration adjustments.For the new machine hobbyist like me - beware, this is not for the faint of heart. It is not hard, but very meticulous and time consuming using tools far less accurate that what you've become accustomed to (In many cases I hand drilled holes in the lathe body). From the videos I watched, I fully expected this level of effort. I had to fabricate some brackets, drill and tap many holes on my lathe, machine some standoffs, etc. If you've had a small lathe or mill for a while, this isn't a big deal. It took me 4 evenings after work to get it done. The good news is that the scales were designed for this expected less than accurate drilling. They are slotted and allow you to adjust finely running an indicator along the scale until it runs parallel.Hope this helps!