The Cool-Tech 34700Z recovers, recycles, evacuates, leak tests, and recharges R-134a quickly and accurately. - Automatic Function - With this new option, you can program the unit to recover, vacuum, leak test, charge, and then walk away without having to operate panel valves. - Vacuum Leak Test - Will monitor the vacuum level after an evacuation, and inform the technician of a possible leak in the vehicles A/C system. - Automatic Refrigerant Refill - With this latest advance, you never have to stop in the middle of a job to change refrigerant tanks. The unit maintains 12 to 15 pounds of refrigerant in an internal vessel, and signals when its time to change the supply tank, so no monitoring is required. - Automatic Air Purge - Eliminates damaging air without any monitoring of gauges or opening of valves. - Automatic Oil Drain - The unit automatically drains system oil captured during recovery, and the display reminds you to empty the bottle. - Refrigerant Charging - Has never been this easy. Select a change mode from either the high side, low side, or both. - Accuracy features eliminate guesswork! - Electronic Scale - The scale weighs recovered refrigerant and charges by weight for greatest accuracy. - Internal Storage Vessel - Refrigerant is recovered into and charged out of this vessel, which is permanently mounted to the electronic scale for continuing reliability. - Internal Manifold - A Robinair exclusive, this block manifold contains all the solenoids that control re