Siemens Milltronics "The Probe" Ultrasonic Continuous Level Transmitter. Model: The Probe. S/N: P138290. Measurement range: 9.6 in. to 16.4 ft. Accuracy in air .25 % of the target range. Power Rating 12-30 Vdc @ 0.1amp max. This ultrasonic device combines sensor and electronics in a single package for effective liquid level measurement in open or closed vessels. This sleek, durable package combines the sensor and electronics in a single molded body. Electronics are potted in rugged PVC; the wetted part, encasing the transducer and temperature sensor, is made of injection-molded Tefzel, a fluoropolymer inert to most chemicals. Siemen's advanced software effectively discriminates between real and false echoes to add to the inherent accuracy of the unit. Inlets/outlets: (1) 1 in. dia. S-Line fitting. Overall dimensions: 16 in. L x 4 in. W x 11-1/4 in. H.