The series A1 is a digital pressure gauge for positive, negative, and differential pressure measurement designed to be a direct replacement for mechanical gauges.

The series A2 is a digital pressure gauge for positive, negative, and differential pressure measurement designed to be a direct replacement for mechanical gauges.  The A2 includes a bright LED Process Arch 

The Series A3 is a digital differential pressure control with flow and velocity functionality. The A3 is available with (2) SPDT relays, and a 4-20 mA output.  The A3 includes a a LCD programming display. 

The Series A4 is a digital differential pressure control with flow and velocity functionality. The A4 is available with (2) SPDT relays, and a 4-20 mA output.  The A4 includes a brighter, easier to read OLED programming display.