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Vials, the vital components in a spirit level

Hultafors - United Kingdom

The fluid-filled containers that give you a level reading are called vials. The liquid in the vials is usually oil or alcohol so that the air bubble inside can move freely.

Sturdy mounting for higher sensitivity

How the vial is mounted in the profile determines how sensitive it is to temperature and shock. On the best spirit levels the vials are fitted with a tensioning wedge, ultrasound welding or brackets for maximum accuracy and sturdiness.

Our Vials are filled with oil

The liquid in Hultafors’ vials is a coloured low viscosity oil mixture. This gives the bubble optimal freedom of movement and makes it easy to read.


To facilitate reading, extra fine vials feature a magnifying lens to make the bubble appear larger, and rings that go all the way round for accurate readings from any position.

A luminescent reflector behind the vial helps in dim light conditions.

Unaffected by temperature and uv light

The oil in Hultafors’ vials is highly resistant to both ultraviolet light and fluctuations in temperature and gives a consistent bubble movement from -20° C to +60° C. In case of shock, the temperature resistance also prevents bubbling.

Antistatic vials for accuracy

Static electricity can cause some spirit levels to give inaccurate readings. Therefore Hultafors spirit levels feature antistatic vials.

More to explore ↓

Why length matters

The strength of the spirit level is determined by the shape and thickness of the profile, as well as the holes for the vials.

Learn more about the profile and end caps

Why sensitivity matters

The higher the sensitivity the more precise the spirit level is. This means that the bubble of a more precise spirit level reacts more when one end of the spirit level is lifted.

Learn more and watch our video

How accurate is your spirit level?

Manufacturing tolerance is the sum of all possible minor and microscopically small errors during production. Tolerance is thus the divergence from sensitivity, and the smaller the value the better.

Learn more and watch our video

HV & PV - precision tools for professional users

For professional craftsmen a great spirit level is a vital tool for a job well done. A workhorse you need to rely on to make sure you deliver high quality work.

Precision levels for professional use

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