Features 【High Quality Material】: The horizontal line measuring instrument is made of special acrylic and ABS materials, with a transparent acrylic cover on the outside. The measurement direction is easy to identify and the horizontal direction is clear at a glance. 【Main functions】: This mini bubble level is mainly used to measure the horizontality and verticality of objects. Check whether the object being measured is parallel to the horizontal plane and whether it is tilted left or right. 【How to use】: Just place the circular level bubble where you need to measure. When the bubble level is placed on a horizontal surface, the bubble will stay in the middle of the tube and you can determine whether the object is level. 【Scope of application】: This measuring instrument is suitable for art photo frames and murals, paintings, levels, cameras, precision instruments, etc. 【Package Size】: 5 pieces of 15 x 15 x 40mm measuring instruments, high precision, easy to use, fast and accurate, widely used in professional measurement and daily use. Features: 1.The horizontal line measuring instrument is made of special acrylic and ABS materials, with a transparent acrylic cover on the outside. The measurement direction is easy to identify and the horizontal direction is clear at a glance. 2.This mini bubble level is mainly used to measure the horizontality and verticality of objects. Check whether the object being measured is parallel to the horizontal plane and whether it is tilted left or right. 3.Just place the circular level bubble where you need to measure. When the bubble level is placed on a horizontal surface, the bubble will stay in the middle of the tube and you can determine whether the object is level. 4.This measuring instrument is suitable for art photo frames and murals, paintings, levels, cameras, precision instruments, etc. 5.5 pieces of 15 x 15 x 40mm measuring instruments, high precision, easy to use, fast and accurate, widely used in professional measurement and daily use. Specification: Measuring range: 1200（mm） Accuracy: 30 Size:15 * 15 * 40mm / 0.6 * 0.6 * 1.6in Weight: 48 g / 1.7 oz(approx.) Package list: 5 x String Line Spirit Level Instructions for use: When the bubble deviates from the center position, the position of the object needs to be adjusted to bring the bubble back to the center position. Package List