Wheeler Engineering Level, Mounting Leveling Tool with Magnetic Base and Adaptable Design for Scope Mounting, Gunsmithing, and Maintenance, Color may vary

Haven't tried them but these look like they will werq

Good

Great tool for properly aligning and attaching, Scopes or eye sights

Good level, level sticks directly to rail. Very easy to use.

Great

I purchased these bubble levels at the same time I purchased the Wheeler Fat Wrench. I bought the levels to try them out and to see how useful the bolt raceway level was in helping to get the scope square with the rifle. I've rated these products with a 3-star rating: the bubble levels are OK but in terms of applying them as recommended I doubt their efficacy.I shoot rifles at long range and it is absolutely critical that the scope is square with the rifle and that the rifle is held square with the Earth. The reason is simple: when the scope is adjusted for elevation and the reticle is moved downward to elevate the muzzle for farther distances it must move exactly vertical. If it drifts right or left the shooter inadvertently holds respectively left or right thereby inducing an unintended windage factor. In looking at the two bubble levels, the idea here is that one level sits on top of the elevation turret knob to level the scope and a second level sits perpendicular to the bolt raceway in the receiver. The theory is, apparently, that if the top of the elevation turret knob matches the level in the receiver, the scope will be square with the rifle. Well, maybe. But what about getting the rifle square with the Earth. That takes a third level which will have to be clamped to the scope and have the same level as the other two.I prefer not to have a bubble level sitting on top of the scope tube. It is extremely visible as well as being ugly. I prefer a scope rail mounted anti-cant level so my focus is on getting the scope square with the Picatinny rail and not with the bolt raceway. If the anti-cant level on the Picatinny rail is level and if the horizontal reticle is level with the Picatinny rail, then the likelihood is that the reticle is square with the Earth. So I only have to deal with making sure that the level on the Picatinny rail is in fact level with the Earth. Then the task is to ensure that the scopes reticle is square with the Picatinny rail. Leveling the rifle for shooting, therefore, involves only deploying the anti-cant device on the Picatinny rail with the knowledge that the reticle movement is precisely vertical to the Picatinny rail which is itself level with the Earth.Would I buy these bubble levels again? Probably not. The small bubble level used for placing on the top of the elevation turret cap is a good size and useful in a number of places and scenarios. The magnetized bolt raceway bubble level is, however, limited to its purpose and is therefore less useful in my view. But both levels are encased in plastic and while some effort was made to square up the one to be used in the bolt raceway, these levels are not, in any sense, machinist grade or even high grade products. But they are useable and hence the 3-star rating. They are OK. I would like something a little more precise in manufacture.Edited 12 July 2013:I forget that precision long range shooting is sport with relatively few participants and that most tools of this sort are not geared to this level of precision. Using a level, even a very good level, across the top of the elevation turret as shown in the product picture is not a precision way to get a scope square with the bore, but it is very acceptable for hunting scopes where targets will be under 400 meters. Therefore, if you are looking to get your hunting scope square, then these levels will work just fine as shown. (An alternative would be the Starrett 135A bubble level.) However, if your ranges require elevations of 10 MOA/3 Mils or more, I wouldn't depend upon this product nor the method of leveling shown.

Makes scope mounting much more precise

The documentation that came with the levels said that the scope could be leveled to the receiver and not to just the scope base. Of course this would be optimal so that any irregularities in the mounting of the scope and the mount base would be of no consequence in aligning the scope cross hairs to the bore such that the vertical cross hair was exactly perpendicular to the center of the bore below.Well, surprise, surprise. I own a Savage Model 11 in 308 and the sides of the ejection port are not at the same level, not remotely at the same level. Presumably, Savage wanted to ensure spent cartridge ejection. So, the magnetic level for the rifle (not the one for the scope) can't possibly find level. As a result, it couldn't be used as a reference measure to adjust the scope to the bore.OK, I then tried to use the magnetic level on the scope mounting rail. The magnetic part of the level was BARELY LONG ENOUGH TO STRETCH ACROSS THE TWO SIDES OF THE SCOPE MOUNTING RAIL. Furthermore, I forced it to find a support from one side and then the other side of the scope mounting rail assuming that doing so I could determine if the level's "level" reading was reproducible. NOPE.Now, maybe that test failed because the scope mounting rail wasn't particularly well made. But as the device was designed exclusively to work on ejection ports where both sides of the port are of the same height, that was my only alternative to try to make the level work.Failure.Additionally, the magnetized level for the scope itself is supposed to be placed atop the elevation adjustment mechanism on top of the scope. The presumptions being that the adjustment knob's surface is perpendicular to the barrel of the scope and hence the vertical cross hair.The level is magnetic to hold it in place atop the adjustment knob. Well, well, well, my scope has a composite, non-metallic adjustment knob and the level couldn't adhere. The slightest movement of the rifle dislodged it causing enormous frustration on my part.I don't know how Amazon handles complaints that are, well, strongly worded. So, I'll refrain from saying exactly what I think of the Wheeler product.BUT THERE'S NOT WAY UNDER CREATION THAT I'D RECOMMEND ANYONE TO BUY ONE OF THESE "LEVELS".For the first time in many years of purchasing items from Amazon I'll return these for a full refund.