Mini Bubble Spirit Level Gradienter Inclinometer Spirit Level Bubble Made from excellent acrylic materials, the glass has a light transmittance of 92 percentage so that the bubble will show the level directly.
Mini Bubble Spirit Level , high optical clarity material. Precision machined internal radius. Black lines, internally fitted gives minimal parallax errors. For professional measuring and normal usage
Spirit Level Bubble-Tube Vial Small Bubble Level has a wider application to showing the level of wood measuring tool, industrial equipment, medical appliances, desktop, camera, and other places of higher accuracy.
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.