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The 552 confirms the evacuation of air conditioning, heat pump and refrigeration systems. It requires no cleaning and is not susceptible to contamination from oils. The absolute pressure sensor delivers accuracy to plus or minus 10 microns. The unit is designed to withstand a 6-foot drop. Additional features include: battery life to 2,400 hours; high-limit alarm; and display of water evaporation temperature. For owners of the 570 digital manifold, the 552 can be connected to the 570 to data log or print evacuation data.