1) SC520 : - 4~20mA Analog / RS 232, 485 Digital Output - 2 Channels 2) SC521 : - 4~20mA Analog - 2 ChannelsCONTROLLER (for Old Sensors)$0.00PriceController (UCX-d)*SC520SC521Quantity*Add to CartProduct InfoUCX Universal Controller connects with all Bluesen turbidity sensors to display, transmit, store data, and calibrate sensors. Specification Display 4.3 inch TFT LCD Touch Screen Operating Temperature -20 ~ 60 °C (-4 ~ 140 °F) Power & Consumption 100 ~ 240 VAC 50/60 Hz, 4.2W (unconnected) Sensor Connection Up to 4 sensors (optional) Current Output 4 ~ 20mA DC * 1 or 3ch (optional) Relay Optional: 3 points Data Download USB, SD Card Water proof IP66 Weight 1.3kg