The Fieldpiece SMAN340 hits the mark with its rugged design that's based on years of technician feedback. The SMAN340 digital refrigerant manifold are not only tough, they also show everything HVACR pros need all at once: 2 pressures, and 7 temperatures, plus which refrigerant is being used. View calculated target superheat while monitoring how the charge is affecting actual superheat and subcooling.