For the most precise long-range shooting, use the bubble level to ensure that the rifle is perfectly vertical. This will eliminate potential error caused by shooting a canted rifle.
Mounts quickly and easily to the riflescope tube.
Features of Vortex Scope Level BL30, BL35:
Use on 1-inch, 30mm, 34mm or 35mm riflescope tubes to vertically align the reticle crosshair.
