The dual display, half-rack, microprocessor-based Modular Vacuum Gauge replaces the numerous instruments previously required for different functions and ranges. Configurations include various combinations of ionization, thermocouple, convection, diaphragm and setpoint relay modules. Assignments of up to 8 relays and setpoint hysteresis are controlled from the front panel. The ionization gauge can be turned on manually or automatically. The MM200 Modular gauge is designed to be the most flexible solution to vacuum measurement and control.