Mini Rope Level Portable and practical Accurate to meet your needs Level is a measuring tool commonly used to measure small angles. It is used in the machinery industry and instrument manufacturing industry to measure the inclination angle relative to the horizontal position, the flatness and straightness of machine tool guide rails, the horizontal position and verticality of equipment installation, etc. Product Description Measuring range: 10 (mm)Accuracy: 30Scope of application: photo frame level, field straight line levelPackaging size: 11 * 8 * 2 cm / 4.3 * 3.1 * 0.8 inchesWeight: 30 g / 1.1 oz (approx.) 5x rope level Level First use the level to check, first place the level on the flat plate, read the size of the bubble scale, then turn the level to the same position, and read the size of the bubble scale again. If the readings are the same, it means that the relationship between the level base and the bubble tube is correct. Otherwise, it must be adjusted with the fine-tuning screw until the readings are exactly the same before measurement. If you want to check the accuracy of a level, you can use a known angle formed by a sine bar and a gauge block. You can also use a sine bar with a level if you want to measure larger angles of inclination. Applications