The Stabila 17773 Pocket basic spirit level is an ultra-compact mini format spirit level that is ideal for those who need to align units and fixtures quickly. The Stabila Pocket basic spirit level features Stabila's patented solid block vial design, which casts the vial directly into the body of the level for guaranteed long term accuracy and is suitable for horizontal measurements. The Stabila Pocket basic spirit level is a handy, compact spirit level which is ideal for carrying from job to job.