10 Best Scope Bubble Level Reviews in 2021

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If you are serious about shooting, owning an anti-cant device for your weapon is highly valuable for better performance. Leveling is crucial for a shooter, especially for a long-range one. Therefore, a good quality bubble level is important for your riflescope tube.

Looking for expert suggestions on deciding the best scope bubble level? This article has been put together to do just that. It includes reviews of all the best anti-cant devices that can make your shooting experience in 2021 much better. 

Moving the rifle around strategically to keep the target in the line of sight will keep the crosshairs locked on them. At the same time, the scope will not be aligned to the barrel of the rifle anymore. This means that when the shot is fired, it will impact a slightly different spot. When speaking about shooting over longer distances, this change becomes drastic.  

Here are the best scope bubble level reviews in 2021 for you to choose from. Be sure to pick the one that suits your requirements and harnesses the most benefits of your investment.

Best Scope Bubble Level in 2021: A Quick Comparison Table

Image Product
Vortex Optics Riflescope Bubble Level
  • Suitable for 1-inch riflescopes
  • Large bubbles
  • Convenient placement
VIEW ON AMAZON →READ REVIEWS →
Lone Star Precision Scope Bubble Level Indicator
  • Suitable for 30mm, 34mm, and 1-inch riflescope tubes
  • Uses aircraft-grade 6061-T aluminum
  • Fully CNC machined scope level
VIEW ON AMAZON →READ REVIEWS →
Vortex Optics Riflescope Lo Pro Bubble Level
  • Slim, low profile design
  • One-piece design
  • Suitable for 30mm, 34mm, and 35mm riflescope tubes
VIEW ON AMAZON →READ REVIEWS →
JIALITTE Rifle Scope Bubble Level
  • Compatible with 1-inch and 30mm riflescope tubes
  • Crafted from full aluminum alloy
  • Locks with the help of bottom screw
VIEW ON AMAZON →READ REVIEWS →
LVLing Metal Spirit Gunsmithing Tools and Accessories Bubble Level
  • Compatible for 20mm lead rail
  • Weighs about 0.5 ounces
  • Patented simple-spirit design
VIEW ON AMAZON →READ REVIEWS →
Flatline-Ops Sniper Accu/Level Articulating Scope Level
  • Fits scopes of 30mm width
  • Utilizes high visibility fluorescent fluid
  • Articulating anti-cant device
VIEW ON AMAZON →READ REVIEWS →
US Optics Swivel Anti-Cant Device
  • Can be fitted onto scopes of any size
  • Type III hard-anodized body
  • Articulating type of scope level
VIEW ON AMAZON →READ REVIEWS →
Wheeler Engineering Anti-Cant Indicator
  • Fits 1-inch tubes
  • Can be mounted on scope tubes
  • Built with industrial-grade hardware
VIEW ON AMAZON →READ REVIEWS →
Holland's Signature Series Scope Level
  • Fits riflescope tubes of size 1-inch, 30mm, 34mm, and 35mm
  • Hard black anodized finish
  • Reflective illumination
VIEW ON AMAZON →READ REVIEWS →
HooGou Optical Scope Bubble Level
  • Made for 1-inch, 30mm, and 24.5mm scope tubes
  • Locked on using the head screw
  • Weighs 0.45 ounces
VIEW ON AMAZON →READ REVIEWS →

Scope Cant Error Explained

A cant error occurs when the rifle bore axis along with the axis of the scope is not aligned in a vertical plane. This becomes one of the many factors behind why a shooter fails to hit the target with accuracy while taking part in precision shooting. 

When the tip of the gun barrel is raised to compensate for gravity while shooting at a target, the gun barrel does not remain parallel to the straight line of sight, from the eye to the acquired target. As a result, the bullet will hit the target a little to the side or lower than where it was actually aimed at. This is a classic shooting error, and how distant is a shot from the desired impact point is directly proportional to the distance of the target.   

A simple way to eliminate scope cant error is by making sure the scope’s horizontally positioned crosshair is leveled, or rather horizontal. Scope levels are also ideal tools to eliminate the cant error. Many shooters use the horizon as a way to check the cant error. A problem with this method is that, unless the horizon is flat like when a large water body is involved, the horizon is uneven and cant error remains. Slopes are one of the most misleading terrains one could pick as a way to check cant error. 

The most effective way to resolve the issue of cant error is a good scope level. A good scope bubble level will be able to ensure that the rifle is always held in the same manner as when it was sighted at the range. Some of the most popular brands producing scope bubble levels are Vortex Optics, Flat-line Ops, and Holland’s. These bubble levels show exactly how much misalignment is there between one’s scope and rifle.

1. Vortex Optics Riflescope Bubble Level

Quick Summary

  • Suitable for 1-inch riflescopes
  • Large bubbles
  • Convenient placement
Vortex Optics Riflescope Bubble Levels

This riflescope level helps achieve that much-needed high level of accuracy. This product aids in eradicating the chances of possible miss-fires and faulty target acquisition, which is caused by using a canted rifle. Installing this on the rifle will lead to a highly accurate and on-point shooting experience, mainly for long-distance sessions. This is recommended for entry-level shooters. 

It is made of materials capable of resisting wear and tear, most importantly aluminum, although it weighs only about 0.1 pounds. Thus, the shooter cannot even feel that the scope exists while holding the rifle. Furthermore, attaching this product to the riflescope tube is as good as a layman’s task. It can be mounted in under 30 seconds and that is a useful advantage, mainly for hunters who are always on the move.

Also, the scope level has large bubbles that indicate the error clearly. It is also available for tubes of size 35 mm, 34 mm, and 30 mm, apart from the standard 1-inch size. The device is so simple and yet can give crisp and precise shots.

What We Liked
  • Guarantees a high level of accuracy
  • Extremely easy to use
  • Lightweight and suitable for outdoors
  • Simple to install
  • Conveniently large bubble to indicate the cant error
What We Didn't Like
  • Design may be bulkier than the competitors

2. Lone Star Precision Scope Bubble Level Indicator

Quick Summary

  • Suitable for 30mm, 34mm, and 1-inch riflescope tubes
  • Uses aircraft-grade 6061-T aluminum
  • Fully CNC machined scope level
Lone Star Precision Revoluntionary Scope Level Indicator (Anti-Cant) for Precision Shooting, Competition and Hunting Fits 30mm

Manufactured in the Lone Star state of Texas, this precision scope bubble level indicator is a bang-on choice for expert long-distance shooters. This is a top-quality tool, CNC machined from Aircraft Grade 6061-T Aluminum, helping acquire a greater level of precision. That too with a tolerance rating lower than 0.0005 of an inch.

Its extraordinary design allows for time-efficient mounting on 30mm, 34mm, and 1-inch riflescope tubes, and this happens without having to detach the scope. This design also allows the scope level to fit all modular rail systems. There is also another new addition of the three inches wide bubble which makes the cant error more visible. 

It is one of the best scope bubble level at a modest price and with excellent quality. The scope level can be mounted ambidextrously and is suitable for precision shooting, competitions, and varmint hunting.

What We Liked
  • Can be installed for right or left-handed shooting
  • Lifetime warranty is offered by the company
  • Hand-assembled in the US
  • Large bubble for easy viewing
  • Fits all rail systems
What We Didn't Like
  • Some users suggest that the scope bubble level is suitable only for low recoil rounds

3. Vortex Optics Riflescope Lo Pro Bubble Level

Quick Summary

  • Slim, low profile design
  • One-piece design
  • Suitable for 30mm, 34mm, and 35mm riflescope tubes
Vortex Optics Riflescope Lo Pro Bubblevel 30-mm , Black

It can be said without a doubt that using good equipment during hunting will definitely result in a wonderful experience. The Vortex Optics Riflescope Lo Pro Bubble Level is one of the most in-demand and budget-friendly scope mounted for anti-cant devices. It can easily be installed and is a scratch-proof device.

This device can be mounted on 90% of all scopes without having to separate the scope from the weapon. Available in four scope tube sizes that cover the range of most popular scopes, its production pipeline comprises of machined aluminum combined with a protective finish that is jet-black. Ideal for hunting varmints or amateur long-range shooters, the device makes sure that the scope and rifle are aligned precisely. 

Since the scope is fused with a viscous type of fluid, the bubble will exist under all circumstances. Combined with the extremely lightweight body of the device, it is portable and does not block the view while aiming.

What We Liked
  • Made to be low profile and suitable for tactical operations
  • Small in size to avoid distractions
  • Can be used with left and right eye
  • Easily attachable and can be mounted without removing the scope from the firearm
  • Visible while maintaining the sight picture
What We Didn't Like
  • Some users find it harder to align the device with the scope

4. JIALITTE Rifle Scope Bubble Level

Quick Summary

  • Compatible with 1-inch and 30mm riflescope tubes
  • Crafted from full aluminum alloy
  • Locks with the help of bottom screw
JIALITTE Bubble Level for 1in / 30mm Tube

Useful in decreasing the unwanted common error while using a canted rifle, this device can be quickly mounted onto any scope. As a standard budget-friendly scope level, it is easy to read because it is factory calibrated and has lines for reference. With commendable workmanship, the accessory comes with the promise of the rifle remaining perfectly vertical.

This well-designed JIALITTE Rifle Scope Bubble Level is equipped with a 30mm milled inside diameter, merged with an inside insert ring to make it also suitable for 1inch-diameter main tubes — making this dual-diameter versatility is a positive attribute. A high level of precision is guaranteed with this device that is CNC-machined using full aluminum alloy. 

Like a good scope bubble level, it does block the windage turret and view of the elevation. Also, the scope level can be secured onto the scope using the bottom screw which endears the product to a large group of shooting enthusiasts.

What We Liked
  • Has lines for reference
  • Can be mounted effortlessly
  • High-quality workmanship
  • Rounded edges to prevent damage to clothes
  • Comfortable offset level
What We Didn't Like
  • Fluid could have more viscosity

5. LVLing Metal Spirit Gunsmithing Tools and Accessories Bubble Level

Quick Summary

  • Compatible for 20mm lead rail
  • Weighs about 0.5 ounces
  • Patented simple-spirit design
LVLing Metal Spirit Gunsmithing Tools and Accessories Bubble Level for 20mm Picatinny Weaver Rail Rifle Sight Scope Mount

Attaching directly to the mounting rail, this product ensures bore and reticle alignment with a single glance. Since this is a versatile scope bubble level, it can be placed anywhere, be it before, after, or under the scope. This anti-cant device can only be fixed on rails of the width of 20mm. 

The most notable point about this scope bubble level is that it is extremely shock-resistant. It makes the bubble level suitable for use on fire caliber and air rifles. This level can be adjusted to any position, either for left or right-handers, to fire with utmost accuracy. 

Being scratch-resistant, this scope level’s body is durable and the viscous fluid in the housing does not evaporate or leak easily. The singular bubble in the fluid is stable and is not affected by the weather. Also, this device fits on Weaver or Picatinny rails.

What We Liked
  • Can be used on real fire caliber as well as air rifles
  • Shock resistant
  • High versatility when it comes to the place of attachment
  • Attaches directly to Weaver or Picatinny dovetail designs
  • Holds well even after rough use
What We Didn't Like
  • Needs extra tightening to stay level

6. Flatline-Ops Sniper Accu/Level Articulating Scope Level

Quick Summary

  • Fits scopes of 30mm width
  • Utilizes high visibility fluorescent fluid
  • Articulating anti-cant device

The Flatline-Ops Sniper Accu/Level Articulating Scope Level, unlike most articulating anti-cant equipment, mounts on the scope without having to detach and re-attach it. It has every feature a serious long-range shooter could need in a riflescope bubble level. This scope can be installed to suit both, left-handed and right-handed shooters. 

Makes use of a fluorescent fluid that is highly visible during nighttime and other low light conditions. This makes it simpler by margins for the hunter to pick up the cant in the equipment before each shot. Most importantly, to ensure shots are fired as intended, double detents are locked into position on the level arm of the equipment.

Another notable feature is that the scope level has an option to make fine adjustments after it has been attached, whether in a boundary-oriented or an open position. Owing to the solid construction of the product, it can withstand a significant amount of rough handling. This scope bubble level is essential in the gear of shooters specializing in long-range precision shooting, Special Ops, and sniping.

Read more: 10 Best Scope for Marlin 336 – Reviews & Buyer’s Guide

What We Liked
  • High visibility in poorly lit conditions
  • Allows to make fine adjustments to the alignment
  • ADI compatible
  • Comes with a dovetail accessory lug
What We Didn't Like
  • Need to remove the scope for installation in some cases

7. US Optics Swivel Anti-Cant Device

Quick Summary

  • Can be fitted onto scopes of any size
  • Type III hard-anodized body 
  • Articulating type of scope level
US Optics Swivel Anti-Cant Device

The US Optics Swivel Anti-Cant Device is an articulating and rail-mounted accessory. Its quality and built make it suitable for all kinds of long-range shooting and tactical hunting in particular. Though the articulating level arm is capable of swinging only in one direction, it can be mounted on the left or right side of the rifle. 

The design of the device allows it to be mounted on all 1913 Picatinny rails without removing the scope. Since the device is mounted on the scope base, the shooter does not have to look up to see the bubble level. For accuracy, even after continuous shooting, any slope in the swivel joint is resolved by the close-tolerance parts.  

In order to lock the scope bubble level in place, there is a set of opposing detents that holds the position in an open or closed state. For protection, the device comes with a knurled vial cover that can be screwed on. Since the base of the level indicator is small and made of aluminum, exercising some caution while installing is advised.

What We Liked
  • Mounts to all 1913 Picatinny rails
  • Swivel bubble level
  • Comes with a screw-on vial cover
  • Easier to read as it is mounted on the scope base
  • Gives accurate readings even after repeated shots
What We Didn't Like
  • If the clamping screw is over-torqued, it can give wrong readings

8. Wheeler Engineering Anti-Cant Indicator

Quick Summary

  • Fits 1-inch tubes
  • Can be mounted on scope tubes
  • Built with industrial-grade hardware
Wheeler Engineering Anti Cant Indicator, 1-Inch

The Wheeler Engineering Anti-Cant Indicator is a scope-mounted articulating indicator that has amazed the shooting enthusiasts with its sturdy body, precision CNC-machined parts, and top industrial-quality components. It indicates precise and repeatable levels of gun positions. 

One of the most attractive features of this device is how it locks into position. This device makes use of an external spring that is installed against a washer to hold its position, instead of detents that are easily worn out. As a result, the device also has great repeatability, thanks to the washer and spring mechanism. 

Additionally, there is a machined indicator point in the level vial housing that helps the eye smoothly position the bubble, by taking the assistance of the two lines before each shot. Moreover, it does not block the adjustments or the view while being used. This device from Wheelers is a long-lasting scope bubble level that should undoubtedly be included in your long-range shooting gear.

What We Liked
  • Locks into position without the use of detents
  • Has a machined indicator point in the level vial housing
  • Heavy-duty clamping ring
  • Can be folded when not in use
  • Easy to view from shooting position
What We Didn't Like
  • May not withstand heavy recoil

9. Holland's Signature Series Scope Level

Quick Summary

  • Fits riflescope tubes of size 1-inch, 30mm, 34mm, and 35mm
  • Hard black anodized finish
  • Reflective illumination
Holland's Signature Series Scope Level(35mm)

Designed by long-range shooting instructor Darrell Holland and being the go-to level of the USA F-Class shooting team, the brand produces the easiest to see anti-cant level on the market. One of the most unique elements of this anti-cant device is its capability to analyze and decide a level in low light conditions.

This device is purchasable in 1-inch, 30mm, 34mm, and 35mm scope tube sizes to manage even the most popular F-Class long-range scoping equipment. Made from 6061 aircraft-grade aluminum with a hard black anodized finish, it is one of the best scope bubble level that is suitable for high-end firearms. 

Also, the sleek, low profile design situated on the bottom half of the clamping ring fits along several scope mountings without the need of detaching the scope. The sculptured design also has molded corners that reduce snagging considerably. This scope can be mounted ambidextrously and it also does not protrude beyond the windage or parallax adjustments.

Read more: Best Spotting Scope Under $500: The Hunter’s Choice

What We Liked
  • Ideal for competitive long-range shooting
  • Reflective illumination for low light visibility
  • Lightweight makes portability stress-free
  • Special design by industry experts
  • Contoured corners for minimized snagging
What We Didn't Like
  • Reports of low resistance to recoil rebounds were seen

10. HooGou Optical Scope Bubble Level

Quick Summary

  • Made for 1-inch, 30mm, and 24.5mm scope tubes
  • Locked on using the head screw 
  • Weighs 0.45 ounces
HooGou Optical Scope Bubble Level for 1 inch 25.4mm 30mm Tube Riflescope Tubes Anti-Cant Used for Shooting and Hunting (30mm)

Designed to be superior and function more effectively than other levels, the HooGou optical scope bubble level is made from high-quality aluminum and is essential for long-range shooting. This scope can be fixed anywhere on the scope tube, according to the user’s convenience. 

One major factor to note about the scope level is that the bubble in the housing remains a steady unitary bubble regardless of the weather around it. Since the device is weather-resistant and can be fixed anywhere on the scope tube, the potential in this device for outdoor shooting is remarkable. 

The scope bubble level fits all lever-action and bolt-action rifles, even Remington 700. With the features like being lightweight, versatile, and non-distracting, this device is made further attractive by the warranty and excellent customer service that the manufacturers provide.

What We Liked
  • Made from high-quality mil-spec aluminum
  • Fits all bolt-action rifles
  • Bubble in the level steadily remains as one
  • Can be mounted on the scope tube
  • Brand offers excellent customer service
What We Didn't Like
  • Under certain weather conditions, the liquid inside the level evaporates

What Makes The Best Scope Bubble Level: Buying Guide 

Size of the riflescope 

Before buying an anti-cant device, make sure of its compatibility with the sizing of the tube. Keep in mind, the mounting of an anti-cant device has to be extremely sturdy so as to avoid any chances of the device falling off. Scope levels that can be attached to the scope tube itself are often the better choice. 

Since they are available in alternative sizes depending upon the brand you choose, the place where you attach your anti-cant device helps you determine the width of the scope level to be purchased.

Accuracy 

This is the most important feature to look for while purchasing a scope bubble level. 

Mostly in tactical settings, shooters miss out on easy shots without discovering the reason. When the target is aimed at with a leveled reticle, the shots are more accurate. 

Since this device is used to avoid errors while aiming, make sure that the scope bubble level gives readings as accurate as possible. Long-range shots are also made more precise this way. 

Cant level 

While shooting on an uneven range, it might be impossible to see how much of the cant error is present. Nonetheless, on a flat range, a well-cared device will show how out of alignment the rifle and the scope are. 

A right level of cant will give the shooter an edge while aiming. Failing to level cant the right way will result in poor aiming and missed targets. 

Durability 

For sure a product that is durable enough to serve for a long time and not only for single-use is going to rank much higher in anybody’s book. Never compromise on the quality of materials used in making the product, this helps assure they are long-lasting.

Since it will be used with various firearms, recoils can never be avoided. Make sure that the chosen scope bubble level has something that will enable them to endure it. Also, make sure it is not easily detachable from the firearm, or the vial will randomly fall off during shooting.

Brand 

Choosing a product from a well-known brand has its perks. Apart from the excellent product quality, well-established brands offer customer support in case the scope bubble level shows problems in the future. 

Also, remember to pick a brand that provides their services near you. This way availing of their services when needed will not become a hassle.  

Price

No matter what, the price of the product is one of the crucial buying factors and the same principle stands for the scope bubble level. Remember, a high-priced scope bubble level is not superior to the other anti-cant devices. 

Even though it may lack additional features, a budget scope bubble level will get the job done. They may also have unique features to offer. 

Mounting 

The way the scope bubble level is attached to the scope makes a huge difference.

  • Scope Mounted: The majority of anti-cant level devices clamp onto the tube section of the scope. They can be placed on either the left or right area depending on individual preferences. This is generally chosen by long-distance shooters or varmint killers.
  • Picatinny Rail Mounted: It is the hinge mechanism that assists these anti-cant devices to swing open when the rifle needs to be used, or fold back in terms of keeping the weapon aside. Never forget, if you have an AR or any tactical rifle, this is a great choice.

Frequently Asked Questions 

Can anti-cant devices be distracting?

If the devices are chosen rightly to suit the rifle and the scope, then it never becomes a distraction. Bulky devices often come in the line of sight while taking aim, this is not ideal. Therefore, always pick a scope bubble level that matches your gear size. 

Will these devices withstand recoil?

Good quality scope bubble levels are built to withstand recoils. The devices like Vortex Optics riflescope bubble levels are strong enough to resist high recoils rounds. Looking for scope bubble levels with such relevant qualities is important before buying them. 

Can left-handed shooters use these products?

Most of the anti-cant devices produced lately can be described as ambidextrous in nature. They can be used equally well by right-handed and left-handed shooters. Hence, left-handed shooting enthusiasts need not worry about the availability of suitable gear.  

Conclusion 

In order to avoid the errors arising due to cant while shooting, all rifle users must invest in a scope level. The best scope bubble level will let you know how you need to adjust the hold over the rifle to avoid the cant error. If selecting the best scope bubble level for you seems overwhelming, we hope this article will be of immense help.  

Our top pick for the best scope bubble level is the Vortex Optics Riflescope Bubble Level. It is a phenomenal bubble level that eliminates cant error for the user and comes in forms compatible with one-inch, 30 mm, 34 mm, and 35 mm riflescope tubes. Also, it is very easy to figure out and convenient to use. 

Be sure to look for all the features mentioned in the buying guide while searching for the best scope bubble level. A scope bubble level is essential to maintain the rifle level, so take time to pick out the best scope bubble to aim precisely all the time.