Since 1907, Ohaus has provided an extensive selection of precision, calibration and general purpose weights and weight sets. Today Ohaus is a 9001 registered company and one of the world's leading suppliers of weighing equipment.We offer precision weights and weight sets that meet or exceed the highest tolerance standards of the National Institute of Standards & Technology (NIST), the American Society for Testing & Materials (ASTM), the International Organization of Legal Metrology (OIML)