Arctic Hayes Digital Differential Pressure Meter Kit (A998673) The Arctic Hayes Digital Differential Pressure Meter Kit is a professional tool for domestic tightness testing and other pressure measurement applications. With a clear digital display and 11 selectable pressure units, this compact kit gives accurate, versatile pressure readings for installers, engineers and technicians. It includes Max/Min pressure functions, data hold and record mode, and a backlit screen for precise, fast diagnostics. The kit comes complete with hoses, battery, carry case and instructions — a ready-to-go solution out of the box. Key Features & Benefits Multi-Unit Measurement: Measures in 11 units — mbar, psi, inches H₂O, bar, kPa, inHg, mmHg, ozin, ftH₂O and kg/cm².