Hach Products Universal Controllers Click here to download the PDF Document for the following products. • sc1000 Probe Module, 4 sensors, 4mAOUT, 4mA/digitIN, 4 relays, Modbus (RS485) 100-240 Vac • sc1000 Probe Module, 6 sensors, 4mAOUT, 4mA/digitIN, 4 relays, Modbus (RS485), 100-240V, with US power cord • sc100 Universal Controller with RS-232 (MODBUS®) • sc100 Universal Controller, Standard