DJ $200
1991The standard for this metric weight is a 2.2 lb. cylinder of platinum iridium alloy kept at the National Institute of Standards & Technology
DJ $600
1989In the metric system, the weight of 1 liter of water is equal to 1 of these units
J $500
1992The only unit of weight still defined by a physical object, a platinum bar, is this 1, equal to 2.2 pounds