These platforms reduce vibration and shock when using precision testing equipment, such as balances. There are two configurations, the passive-air and active-air platforms. The passive-air design requires an optional hand pump if an air source is not available. It requires periodic manual leveling. The active-air design requires an air source (not included) for use. It is a self-leveling unit and recommended for regular use. The load capacity on all models is 200 lb.