Vector Optics Turret Magnifying Glass X-Accu 30mm With Bubble LevelFlip this mark reader up in front of your elevation turret to magnify the numbers and markings, aiding reduced vision and significantly helping in low light conditions. A robust aluminium frame fits around the tube of your scope, while the integrated bubble level ensures perfect vertical alignment even if the scope is then removed and reattached. The quick flip mechanism allows the magnifier to be folded up or down with just one hand.