Use original Adcon add-ON's ! Tailor-made to perfectly match our RTU's (Radio Telemetry Units) and Sensors Adcon offers a wide variety of accessories, which are compatible to all Adcon RTUs. No matter if you want to attach digital SDI-12 sensors, 4-20mA signals, charge your batteries or test the I/O ports of your RTU - Adcon offers the right solution!