Learn about the Nivelco EchoTREK Compact Ultrasonic Level Transmitter. The Echotrek is available with a SAP-200 Local Programmer / display. Features and options include 2 wire or 4 wire, 4-20 mA output, HART, datalogging, Ex approvals, relays and more. Housings available in plastic, aluminum and stainless steel. Polypropylene, PVDF, PTFE and Stainless Steel faced transducer options available.