Vortex Pro Levelling Head for Tripod-Mounted Optics brand_-Acme giving you both a red

giving you both a red and a green clip-on lens

A tapered jacket and inner grooves give consistent expansion across a range of velocities

Reception range is at least 5 metres line-of-sight

and it is safe on breathable membranes such as Gore-Tex

with no metal components anywhere in the safety package

Vortex Pro Levelling Head for Tripod-Mounted Optics brand_-Acme giving you both a redThe Vortex Pro Levelling Head is a compact accessory that sits between your tripod and your optic, letting you get level fast without fiddling with the tripod legs. A built in bull's eye bubble level shows when you're square, and a knurled control ring twists to unlock for adjustment and locks solid once you're set, with 9 of levelling capability to take up any uneven ground. It mounts to a tripod via a standard 3 8" 16 thread sized for the Vortex