Measuring tolerance, standard position

Measuring tolerance, inverted measurement


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Why SOLA has the world's best spirit levels

The most accurate work demands a product of superior quality. At SOLA, we believe that professional builders know best what works for them. That’s why we work closely with you developing our levels to meet those needs. Our goal is to supply the world’s best spirit levels – levels that remain consistent, even in the most demanding conditions on construction sites.


The most important spot on a spirit level is the ½-inch span “between the rings” of the vial. It’s that space that determines if your job is done, or if you need to tweak things a little bit more. As a professional, you look at that space a lot – multiple times a day.

After talking to hundreds of professional builders, we challenged ourselves to come up with a solution to make your daily work easier. The result is the patented SOLA FOCUS vial.

In 2011 we invented this technology and stopped using ring vials in our premium box levels. The reason was simple: Over 80% of professional level users we surveyed overwhelmingly preferred the SOLA FOCUS vial. SOLA FOCUS vials provide a 4x higher contrast than ring vials. This allows an easier, faster reading and more precise measuring.*

* Source: Results of the analysis “Contrasts of vial bubbles”. V-Research, November 2010.


Compared with ring vials, our FOCUS vials enable users to more quickly, accurately and easily read a level. FOCUS vials are designed with a green FOCUS printing and green caps. Their color is reflected by the leveling bubble, creating unparalleled contrast between the bubbles edge and the FOCUS printing.


Our patented FOCUS vial technology enhances the bubble with a magnification of +60%. Your benefit: The bubble movement is more visible and reading errors are reduced to a minimum – even from a distance.

Every horizontal SOLA FOCUS vial is equipped with a luminous backing beneath the vial. This fluorescent light plate enables easier reading of your bubble level in low light situations without any LEDs.


SOLA FOCUS vials are made of break-resistant acrylic material. Besides its resistance to deformation or breakage, the acrylic is highly UV resistant. Our patented ultrasonic welding of the vials ensures no leaks.

The vial fluid is not affected by electricity and will not fade under sunlight. Furthermore, the strictly guarded composition of our fluid prevents bubbling in case of shock. Our formula as performs without problems at a greater range of temperatures than any other level vial.



At SOLA, every bubble level is adjusted individually and undergoes a 100% quality inspection under stringent conditions. Our BIG RED is the most accurate box level in the world.
With maximum deviations less than 0.3 mm/m (0.017°, 0.0003in/in.) in standard and less than 0.5 mm/m (0.029°, 0.0005in/in.) in inverted position, no other level is more precise.

Measuring with box level in standard position
Correct measuring overhead (inverted position)


Our bestselling, sturdiest box level, BIG RED, has an extra strong aluminum profile (890 g/m, 0.61 lbs/ft.) with reinforcing ribs. Among the most rugged levels on the market, the BIG RED profile is engineered to handle relentless use and accidental abuse without losing its shape and compromising your work.

Shock-absorbing END CAPS

Two shock-absorbing end caps protect the level in case of a fall or shock. Equipped with an anti-slip surface, our box levels allow for convenient positioning and a secure grip of the level on the measured surface. The level can be held securely with one hand when marking.

Shock-absorbing end caps protect the box level in case of a fall or shock


All BIG RED levels 32 inches and longer come with two handles. These ergonomically designed handholds provide a comfortable grip and added convenience on our most precise tools.

Ergonomically designed handholds provide a comfortable grip

Milled edges

To make sure you always get the best leveling results, our BIG RED box levels come with only one milled bottom surface. By designing our levels around a single measuring surface, we are able to achieve our extraordinary accuracies. The milled surface is a cue for you so that you use this precision tool in its optimal orientation.

SOLA box level with milled edges for best levelling results