 The string potentiometer may be connected as a three-wire tapped resistor (voltage divider), in a control circuit, or may be packaged with electronics to produce a measurement signal in a useful form, such as a variable voltage 0-10 VDC, variable current 4-20mA, pulse encoder, Bus (DeviceNet and Canbus) and RS232 communications.Measurement ranges vary from about 1 inch to over 100 feet and are available in many appropriate package sizes.Since the measuring cable may sag or be deflected by wind or gravity, the overall precision of a string potentiometer measurement is limited.