J5J44 is a Watlow 935A temperature controller. This controller offers proportional plus integral (P+I) temperature control with digital readout and automatic tuning. It is rated for an operating voltage of line 120 VAC 50/60 Hz and a voltage range of 75-145 VAC. It has a built-in dual-setpoint timer, a dual-channel output, and an RS-485 communications port for networking.