Includes 200 g, 100 g, 50 g, (2) 20 g, 10 g, 5 g, (2) 2 g, 1 g, 500 mg, (2) 200 mg, 100 mg, 50 mg, (2) 20 mg, 10 mg, 5 mg, (2) 2 mg, 1 mg. Class E1 Used as a primary reference for calibrating other reference standards and weights where the stability of the environment and careful handling are assured. Class E1 weights have no method of adjustment and are not suitable for general laboratory use. The uncertainty is guaranteed to be 1/3 the tolerance. Statement of Accuracy Every Troemner Weight and Weight Set, with the exception of Economical Stainless Steel and Cast Iron Weights, where a certificate is not ordered is supplied with a Statement of Accuracy. This statement guarantees that the product has been manufactured to meet the tolerance specifications for its class. Note: The Statement of Accuracy Does Not Provide Traceability and is Not Suitable for Quality and Regulatory Requirements.