Robinair's AC1234-4 is a fully automatic R-1234yf ACS machine. AC1234-4 meets or exceeds SAE J2843 standards for R-1234yf refrigerant recovery. The machine includes an integrated refrigerant identifier that samples the refrigerant in the vehicle's A/C system prior to recovery. The AC1234-4 is a highly accurate and reliable machine capable of servicing both standard and high-voltage vehicle A/C systems. AC1234-4 features: fully automatic operation - program for service, walk away and return when complete, 98.5% recovery efficiency, charge accuracy within +/- ½ oz, automatic internal tank refill, oil drain, and air purge, integrated refrigerant identifier (meets SAE J2927), programmable vacuum operation, system leak test, and liquid refrigerant flushing function.