Robinair (34788) CoolTech Fully Automatic R-134A Refrigerant Recovery, Recycling, And Recharging Machine Combines simple operation with superior accuracy and recovers 95% of the refrigerant with a charge accuracy of +/- 1/2 oz With Automatic Function 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 vehicle's A/C system With automatic refrigerant refill you never have to stop in the middle of a job to change refrigerant tanks Automatic air purge eliminates damaging air without any monitoring of gauges or opening of valves