The Mastercool 91685 Mobile Electronic Charging Station features a lightweight, durable, steel frame cart that contains all the necessary tools to quickly and conveniently charge A/C systems including a 5 CFM vacuum pump, 2-valve manifold, and charging scale. This mobile unit has been designed for garage technicians in which the enlarged carry cart and larger wheels can get around the shop with ease. Use of this station and the rugged die-cast electronic scale eliminates the need for different sized charging cylinders. Users can simply place the refrigerant cylinder on the scale and charge.