The Walchem WDT300-5N1 controller is now obsolete and has been replaced by the WDT400-5N1U controller which now has integrated USB datalogging and software upgrade capability. Otherwise, both the WDT300-5N1 and the WDT400-5N1U have the same specifications with hardwired, cable glands, no 4-20 mA outputs, two graphite electrodes with tees (for in-line or submersion), 20 ft cables.
Please click here to view and/or purchase the new replacement controller and to view literature.
