Measurement Specialties, Inc., Hampton, VA, offers the PT420, an absolute linear position sensor with full-scale measurement ranges from 2 inches to 100 inches. The sensor's two output signals, 2-wire 4-20 mA and 3-wire 0-20 mA, offer feedback signal linearly proportional to the position of the sensor's extension cable. The cable-actuated PT420 provides high accuracy and fine resolution without perfect parallel alignment for easy implementation.

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