Discontinued Modex Automation temperature controllers, designed for mounting in a 92 x 92mm (DIN standard) panel cut-out. The TC500 series had a rotary dial to set temperature; the TC1000 used three decade thumbwheel switches. The 'D' option provided a 'deviation' meter (to indicate deviation between set and actual temperatures). The 'T' option provided an alarm relay that tripped at at a pre-set number of degrees above or below the set temperature (as detailed on the label). There are no Murphy equivalent/replacement products.