Sokkia's PL1 is the product of extensive experience in the field of high technology and sophisticated instrument making. The PL1 First Order Precision Level was developed after long and thorough research into every aspect of use under all possible working conditions. The PL1 has been subject to strict quality control to ensure high accuracy and ease of use. The combination of a tilting mechanism with a sensitivity of 10"/2mm, a coincidence type observation mechanism, and an optical micrometer with a direct reading of 0.1mm, combine to guarantee precise levelling and accurate measurement.