Honeywell 31074399-501 Electrode (0-100° C / 32-212° F). Same as 074399 and 31074399. Connects to Honeywell Pre-amp w/ 12' Quick Disconnect Cable. Honeywell's Meredian glass pH electrodes contain measuring and reference electrodes together with an integral, fast-responding automatic temperature compensator. This configuration allows for simple installation of a single unit either in-line with a pipe or immersed in a tank. These probes operate in temperatures of 0-100° C (32-212° F) and can be mounted in any orientation.