These vials operate in the same way as conventional spirit level vials, the main difference being that the position of the bubble is detected opto-electronically rather than by the eye of the user. As the bubble position changes, the movement can be measured and used to provide information of level and angle to the controlling system. This technology is now widely used in a variety of applications, and we specialise in manufacturing the high performance bubble vial sensors used in such a system. Please contact us for more information.