The GP-4 sensor has 4-20mA output with adjustable span, RS-485 communication, and optional integral telephone modem. Silos up to 100 ft can be measured with a resolution of 1 cm.

With the Remote Display, up to 99 GP-4 sensors can be remotely set-up and configured. Measurement can be remotely requested and displayed. An optional integral telephone modem is available for the Remote Display.