Laserliner Umarex MasterLevel Box Pro 081.262A Digital Electronic Spirit Level

I need an accurate measuring device to mount scopes on my rifles. I am aiming for a max. accuracy of +/- 0.1 degrees. This electronic level is perfect for that.Note: The product-related manufacturer information on the dimensions and weight of the product are completely moronic (length - width - height = 10x10x10cm / weight 250g).The device is square, with an edge length of about 60x 60x 28 mm. The weight is 80g.PSTo calm the system down a bit when tightening the screws, you can insert playing cards between the mounting rail and the IF, because this is exactly the time when you always experience that the system adjusts once again. I don't use metal gauges, because in the worst case they get jammed under the IF when tightening the mounting, I always get the playing cards out. The second advantage of the playing cards is that I can use them to clamp my "Zerobase" at the same time, i.e. a plate that sticks out from the side and serves as a platform for the electronic spirit level.