The Robinair 34288 CoolTech combines simple operation with superior accuracy. It recovers, recycles, evacuates, and recharges R-134A quickly and accurately. Meets SAE J-2788 standards for accuracy: 95% refrigerant recovery and charging to +/- 1/2 oz. Automatic Oil Drain: A display reminds you to empty the graduated container to show the amount of oil to replace. Automatic Air Purge: Eliminates damaging air without monitoring gauges or opening valves. Automatic Refrigerant Refill: Maintains a user-selectable amount of refrigerant in an internal vessel and signals when it’s time to change supply tank, no monitoring required. .Multilingual Display Refrigerant Management System: Displays refrigerant use and monitors remaining filter life. Prompts appear when 1/3 of filter life remains.