MEOPTEX Sport Optics Rifle Scope Bubble Level, 9-11mm 64100

If you have an 11mm rail on your rifle this tool is great.Mounted on the rail perpendicular to the barrel, the level will help you keep the gun oriented properly with the horizon line.It was of great help to me when getting familiar with each of my air rifles (with 11mm rail)

Okay ... the score lines between the “bubble” is far to wide to make an accurate assessment of “level” the edges of the bubble need to meet each side border for quick accurate readings. This level falls way short . I am supposed to assess whether the space between the bubble and the lines are equal??? A good level will have the bubble touching the edges of each line and be able to quickly and accurately determine level

Not even remotely close to “accurate” checked with my machinist tools and not impressed, don’t buy.