The bubble spirit level will make easier and more convenient for you to adjust the level to the highest accurate angle. Made of high-quality acrylic material, the light transmittance of the glass is 92% Size: 29mm x 9mm x 7mm Scope of application: level, camera head, precision instruments etc. Put the spirit level onto the surface you want to measure, the middle position of bubble inside the spirit level will show that the surface is level.