Did a great job for us. We mostly need it to plumb a vertical line over a long distance and it worked perfectly.

So I wanted an economical theodolite for basic surveying of my lot. I really didn't want to pay $800 for an electronic instrument that was accurate to 5 seconds when this instrument is advertised that it is accurate to 15 minutes of a degree. So I ordered it. It arrived with the vertical clamping screw bent about 10 degrees off center. The fine vertical adjustment screw was bent about 30 degrees and was actually loose in the package. I don't see this as a shipping damage issue as there is no way it could of been bent to that degree ... then unscrewed from the instrument. - Second issue was that the vernier scale had marking that did not overlap nor came close to the main out degree scale, making the vernier scale impossible to use. The design and manufacture was flawed which made precise measurement of the horizontal angle impossible ... only accurate to within a degree. - However, it is economical. So I called the manufacturer and asked for them to ship me the two screws so I could at least have a functional unit. They refused, claiming it was damaged in shipping, and just told me to return it to Amazon. So I did. Even though the accuracy was really functional to just a degree, I would have kept it if if they would have replaced the 5 cent screws just because it was so reasonably priced. So I returned it and ordered a digital unit far more expensive, more than I need.

Very nice unit and a great price.

It performs as advertised and as I expected. I am really pleased with this purchase.

This works well as a level. It is quick to set up. I used it for a drainage project. Have not used it for anything else. It appears to be based on a David White patent.