Balance weights come in a variety of forms, including fixed weights, adjustable weights, and fine-tuning weights. Fixed weights are calibrated to a specific mass and cannot be adjusted, while adjustable weights can be set to a range of masses by adding or removing small masses. Fine-tuning weights are used for precise adjustments and are often used in conjunction with adjustable weights.

Balance weights are calibrated using a process called 'mass comparison'. During calibration, the balance weight is placed on one side of a scale and standard weights are placed on the other side until the scale balances. The mass of the balance weight is then equal to the combined mass of the standard weights.

Balance weights should be stored in a cool, dry place away from direct sunlight. The weights should be protected from dust and moisture, as these can affect their accuracy. It is important to keep balance weights in their designated cases to avoid damage.

The frequency of recalibration for balance weights depends on a number of factors, including the frequency of use, the environment in which the weights are used, and the required accuracy. It is generally recommended that balance weights be recalibrated at least once a year or more frequently if they are used in a high-volume or critical application.