We can supply certified calibration test weights and mass standards to 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). We design our tests weights and equipment to minimize the transitional phase of equipment installation so that your operation begins to realize improved productivity and profitability as soon as possible. St. Louis Scale believes in excellence through performance in service and support after the sale. Your business is important to us, and we want St. Louis to be your one source for scales and test weights. Contact us at 314-531-8886 with any questions regarding out extensive selection of calibration test weights and mass standards.