Nice working condition Watt transducer from Scientific Columbus, Model XL5C5PAN7-11.  1 Element, 1 phase, 2 wire, Calibration:  0-750 watts input, 4-20 mA DC output into 750 ohms load (Sticker on side states output is Internally shunted with 500 ohms), Nominal input:  120 V 7.5 A 60 Hz.