Very reliable compass, good construction, reasonable price.
Advantages:
1. Angle scale with excellent resolution (every 2.5 degrees) and 20 milliradians on the milliradian scale.
2. Damping liquid inside to prevent continuous oscillation of the needle/disk.
3. Magnifying lens on the transparent cover, very helpful for precise angle reading, especially in difficult conditions (fogged glasses, etc.).
4. There is also a stronger magnifying lens below the eyepiece slit, which helps even more if someone has trouble reading the scale characters or wants to use it for advanced functions (milliradian ranging).
5. There are 2 phosphorescent dots where the thread of the sighting device is supported, which help at night. You need to illuminate them with a strong light to make them phosphorescent for about half an hour. Then you can illuminate them again, etc.
Disadvantages:
1. The needle/disk is free to float in the liquid. If you're not careful and it touches the wall, it sticks. You have to keep it centered.
2. The rotation of the cover doesn't have the best feel, especially if you're wearing gloves, but at least once you adjust it, it doesn't come off easily.
In conclusion, a very good compass if you know what you're doing, I recommend it