Complete boxed set of F1 Class of Test weights for use with Balances. Constructed from nickel plated brass. Set includes: 1 x 1g - Tol:0.10mg 2 x 2g - Tol:0.12mg 1 x 5g - Tol:0.15mg 1 x 10g - Tol:0.20mg 2 x 20g - Tol:0.25mg 1 x 50g - Tol:0.30mg Supplied with tweezers, glove and dust brush