When you need to transition from close range engagement to mid-range precision shots without putting extra weight on your rifle, the XTM-3 Magnifier is the right tool for you. Sightmark offers the lightest, most compact magnifier in the market today. Weighing only 8.1oz, this 3-inch long magnifier has an 18mm objective lens and provides 3x magnification to a wide variety of rifle-mounted red dot sights.Outfitted with a no-nonsense flip-to-side mechanism as well as a simple locking quick detach mount, the XTM-3 is designed with practicality and ergonomics in mind. Constructed with shockproof 6061 aluminum housing with an IPX7 waterproof rating and a nitrogen-filled chamber to eliminate fog, the XTM-3 Magnifier is a quality magnifier that's built to last.Features:Most Compact Magnifier On The MarketLightest Weight Magnifier On The MarketLocking Quick Detach Mounting Platform For Quick And Easy Mounting/RemovalWaterproof And DustproofFully Multi-Coated OpticsIncreases Magnification Of Accompanying Sights For Greater Engagement RangeFinger Adjustable Windage And Elevation For Reticle AlignmentCompatible With Most Red Dot And Reflex SightsImproved Target Recognition, Especially Medium Range TargetsSpecifications:Magnification (x): 3Resolution: 10.0Objective lens diameter (mm): 18Eyepiece diameter (mm): 30Exit pupil diameter (mm): 5.6Eye relief (in/mm): 2.32 / 59.0Field of view, degree: 6.8Field of view (m @100m): 11.88Field of view (ft @100yd): 35.65Diopter adjustment (+/-): +2 to -2Maximum caliber:.338Shockproof (yes/no): yesFog proof (yes/no): yesIP Standard (water rating): IPX7 (1m for 1 hr)Body material: 6061 AluminumLens material/type: GlassLens coatings: FMCMount type: Flip-to-SideOperating temperature (AdegF/AdegC): -4 to 140 / -20 to 60Finish/color: Matte Black AnodizeLength (mm/in.): 69 / 2.72Width (mm/in.): 55 / 2.17Height (mm/in.): 68 / 2.68Weight w/ mount (oz/g): 8.1 / 230