The magnetic layer is made of aluminum profiles. Equipped with two bottles of acrylic glass. Using the latest technological solutions in the test tube turns clear effect of a magnifying glass. In the lower region of the measurement it was placed on the entire length of a powerful magnet, which provides strong adhesion to the steel surface. Capsules made of acrylic glass is filled with fluid, which increases visibility. Rugged design ensures repeatability. Magnetic base for attaching the tool to the metal parts. Handles are finished with an elastic material that provides comfort. The measurement accuracy of 0.5 mm / m