For sale is a Watlow "Relay Master" Enclosed On/Off Temperature Control w/ Relay Module. 1/60/115V, Single phase AC input power. Labeled PN RM00-1600-A000 / 115V / RNG 50TO500F / 10TO260C / (W) Type J / Made in USA. 50 degrees to 500 degrees Fahrenheit temperature range. Comes with attached Watlow 3-phase Mercury relay. This unit appears to be in very good condition.