The Signet 5700 pH/ORP Monitor is a versatile and intelligent instrument that recognizes the type of sensor connected, either Signet pH or ORP Electrode, then automatically sets itself for the corresponding display and functionality. Also, during "Easy Cal" operation, the monitor automatically recognizes standard buffers/test solutions thereby shortening and simplifying routine calibration procedures. Two programmable relays and one scaleable 4 to 20 mA output are included, and the four-button keypad arrangement with intuitive software design is very user-friendly. The monitors require 12 to 24 Volts, AC or DC, and can be used with the Signet 2720 pH/ORP Preamplifier and Sensor system, or with sensors from other manufacturers by using the 2721 Preamplifier. Several useful accessories are available, including the optional Rear Cover Kit used to extend the NEMA 4X/IP65 integrity of the front panel to the entire enclosure.