Are all anti-cant levels equal?

in my experience, no they dont. the problem i had was the screw and "clamp" did not tighten correctly, making true level wrong. i say this because i tried it on 2 different rails and had 2 other levels that agreed with each other. both times this clamp level was off. ended up tossing it.

I have a level attached to my scope. I find it a very useful accessory. I needed to spend quite a bit of time during the tightening down process to get the level aligned to others that I had attached to the rifle with magnets to get all levels aligned as closely as possible. No, the scope level is not 100% aligned to the others, but it is very, very close and it certainly helps me to ensure that any cant is minimised. A good investment in my opinion.

https://&sr=8-13&kewww.amazon.com/CVLIFE-Scope-Bubble-Level-30mm/dp/B01E6YGVEE/ref=sr_1_13?ie=UTF8&qid=1532219365ywords=swfa+bubble+level no just kidding gotta be a typo SWFA has a nice one and Vortex

I purchased the Hawke level that clamps on the rifles dovetail. Bad move on my part. Poor design on theirs.

In my opinion, NO. As others have mentioned, if you get a level that attaches to the rail, expect to do some filing to make it read "level". 

Another thing to watch out for with the cheaper levels is that the fluid they use is thinner. So, your bubble will move around a lot more. You might think this is a good thing but, it's actually not. You want a little bit of drag to the movement of your bubble. 

Tom

I tend to prefer the ones which clamp to the scope tube, they are adjustable through 360 degrees that way. I start with a professional level resting on the scope turrets. I make sure the turrets are perfectly level, then I add the anti-cant device, and adjust it until it reads level, as the turrets are at level.

So, those that are placed on the rifle bar do not work well no matter what brand they are.

It is best to place on the optically pre - fixed optic.

It should not be decided on price only! Brands are expensive, but there's a reason!

I bought from AliExpress - an bubble leveler with an angler for $ 20.34 but the leveling screw moves a little bit until it's no longer right.

I took mine off the rail. Going to use it as a target.

I like SWFA's 30mm Scope Bubble Level. There's no sharp edges and they come with 1 inch scope tube adapters. 

in my experience, no they dont. the problem i had was the screw and "clamp" did not tighten correctly, making true level wrong. i say this because i tried it on 2 different rails and had 2 other levels that agreed with each other. both times this clamp level was off. ended up tossing it.

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I had the exact same problem with these. The threads are off and make the level cant extremely upwards. 

you won't go wrong with this one, best seller on amazon

https://www.amazon.com/Lone-Star-Precision-Revoluntionary-Competition/dp/B01L8HDJHY/ref=sr_1_2?ie=UTF8&qid=1532423719&sr=8-2&keywords=lone+star+scope+level

I have this Nightforce 34mm top half of ring with level on the way. Looks like it will be perfect on the extended unimount.

I use the Hawke bubble levels on both my air rifles and my 6.5 Creedmoor...........they all seem to work just fine for me.

I hit a 3" plate at 600yds three times in a row the other day with my 6.5 using that level.