The 34288NI combines simple operation with superior accuracy. It recovers, recycles, evacuates and recharges R-134A mobile A/C systems quickly and accurately. The product outperforms the most current SAE J-2788 standards for accuracy and efficiency, recovering more than 95% of the refrigerant in a vehicle's A/C system and charging to better than +/- 1/2 oz of the programmed charge amount. For additional information please see Robinair AC Comparison digital asset. For replacement filter see part# 34724.