The U3M mini Probe Ultrasonic level sensor manufactured by Madison company is small with just over 2"in height over the tank or drum surface and a4" to 6' (0.10m to 1.8m) operating scale. It gives a temperature-compensated signal for better precision and the accessibility to screen false echoes provide by minor restriction. The on-board push buttons authorize for calibration without the demand for software and computers. Relay models for alarm managing by sensors are accessible. The U3M has a PVC casing that authorize for a -40°C to 60°C (-40°F to 140°F) range of operating temperature. discretionary RS485 communications are accessible for computer interfacing for computer interfacing and for networking up to 128 sensors. With Pulse ultrasonic technology Non-contact measurement and Teflon® nozzles accessible.