SURFACE LEVELS

Contact Empire About Level Vials
800-636-8425 or oemsales@empirelevel.com
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Acrylic circular Bullseye levels feature 40 arc minute sensitivity and hot stamped lenses. ABS mounting flange available for Bullseye level #360. Using three #4 flat head screws, the flange will attach to any flat surface.

Understanding Level Vial Sensitivity
When considering level vial sensitivity it is important to know that sensitivity does not reflect the accuracy of a level vial. A highly sensitive vial can be inaccurate and an accurate vial can have low sensitivity. An accurate level vial will read level when in a level position.

Vial sensitivity describes how easily the level vial bubble moves when shifted from its level position to an unlevel position. Bubble movement is determined by the surface inside the vial.

Sensitivity is measured in minutes and seconds. Minutes are a fraction of a degree (or angle). There are 60 minutes in one degree. This means that 1/2° is equal to 30 minutes. Sensitivity is defined as the angle the level needs to rotate to get the bubble to move 1/10th of an inch. For example, for a 20 minute vial the level must tip 20 minutes or 1/3° to move the bubble 1/10th'' or 0.1''. A more sensitive 9 minute level vial only needs to be tipped 9 minutes or 9/60° to move the bubble 1/10th'' or 0.1''.

With a circular level, a 2/3° pitch will yield approximately 1/10'' or 2.5mm bubble movement.

A highly sensitive level vial will allow you to detect very subtle changes, which may or may not be important depending on the type of work you are doing. The real life application is that a highly sensitive vial is not good for use in general carpentry; it would take the carpenter a long time to level or plumb his work. When setting machinery or test surfaces, a highly sensitive vial is necessary to create a more precise level position.
• Levels in horizontal and vertical directions at the same time
• Molded construction with convenient mounting holes
• Use on ranges, refrigerators, washers, dryers, stereos, RV's

Understanding Level Vial Sensitivity
When considering level vial sensitivity it is important to know that sensitivity does not reflect the accuracy of a level vial. A highly sensitive vial can be inaccurate and an accurate vial can have low sensitivity. An accurate level vial will read level when in a level position.

Vial sensitivity describes how easily the level vial bubble moves when shifted from its level position to an unlevel position. Bubble movement is determined by the surface inside the vial.

Sensitivity is measured in minutes and seconds. Minutes are a fraction of a degree (or angle). There are 60 minutes in one degree. This means that 1/2° is equal to 30 minutes. Sensitivity is defined as the angle the level needs to rotate to get the bubble to move 1/10th of an inch. For example, for a 20 minute vial the level must tip 20 minutes or 1/3° to move the bubble 1/10th'' or 0.1''. A more sensitive 9 minute level vial only needs to be tipped 9 minutes or 9/60° to move the bubble 1/10th'' or 0.1''.

With a circular level, a 2/3° pitch will yield approximately 1/10'' or 2.5mm bubble movement.

A highly sensitive level vial will allow you to detect very subtle changes, which may or may not be important depending on the type of work you are doing. The real life application is that a highly sensitive vial is not good for use in general carpentry; it would take the carpenter a long time to level or plumb his work. When setting machinery or test surfaces, a highly sensitive vial is necessary to create a more precise level position.
  • SOUL OF A BUILDER SINCE 1919
    • 1919
    • 1922
      1922
      Adjustable level
      invented by Empire
    • 1935
      1935
      First torpedo level
    • 1956
      1956
      Empire introduces
      Extruded Aluminum levels
    • 1965
      1965
      Empire invents the
      Magnetic level
    • 1967
      1967
      Mono Vial
      revolutionizes
      the industry
    • 1978
      1978
      Empire develops
      Polycast® levels
    • 1994
      1994
      Titan Box level
      is introduced
    • 2004
      2004
      Empire introduces
      True Blue®
    • 2005
      2005
      e70 is
      introduced
    • 2006
      2006
      em71 is
      introduced
    • 2007
      2007
      e50 is
      introduced
    • 2009
      2009
      True Blue® e100
      is introduced
    • 2013
      2013
      True Blue® Second Generation e2G Introduced