The Ultralife 'Accu Max I ' single channel monitor/controllers are designed for continuous operation without interruption. They feature a large .5 inch LED display, piggy-back relay module, recessed adjustment screws and an adjustable 'deadband'. We feel the last feature is the best feature of all. The adjustable 'deadband' (control span) allows for user adjustment to the desired control range. The 'Accu-Max I' controllers are supplied with highly accurate custom pH or ORP epoxy body electrodes with 10 ft cable and BNC connector.