Features and Benefits:�A rugged, lightweight steel cart with wheels and convenient storage pocket for scale and hoses allows this portable charging station to be taken almost anywhere.�240 lb capacity scale with long lasting 9V battery (60 hrs).�Deep micron, rotary vane vacuum pumps. °Extruded aluminum manifold with long lasting valve designA lightweight, durable, steel frame cart that contains all the necessary tools to quickly and conveniently charge the A/C system. No need for different sized charging cylinders with Mastercool�s rugged die cast electronic scale. Simply place the refrigerant cylinder on the scale and charge.