Description 1.Weights is used as a quality standard object, usually are metal blocks; 2.Material measure of given mass and shape; 3.Used for checking weighing instrument and weighing; 4.It is a subordinate physical measurement; 5.No access to corrosive substances; 6.Prevent collision or fall, to avoid bumps or scratches; 7.When in use, do not use hand directly, clamp with tweezers or wear gloves.