If you have lost some weights, or need additional weights for extra heavy tracking, coins can be used with excellent accuracy:

UNITED STATES COINS

US Penny (1Cent):  2.5 Grams (after Tricky Dick); 3.09 Grams (1976)

US Dime (10 Cents):  2.3 Grams (after LBJ the debaser of US currency into slugs and washers)

US Nickel (5 Cents): 5.0 Grams

US Quarter (25 Cents): 5.7 Grams  (after LBJ the debaser of US currency into slugs and washers)

EURO CENTS

1 Cent:  2.33 Grams

10 Cent:  4.10 Grams

20 Cent:  5.73 Grams

50 Cent: 7.92 Grams