8 parameters (DO, COD, pH, ORP, conductivity/salinity, ammonia nitrogen, turbidity + temp), RS485 (Modbus/RTU), automatic cleaning, quick-plug connector, anti-blocking protection cover,DO:0~20mg/L; COD:0~200/500mg/L; pH:0~14pH; ORP:-1500~+1500mV; Ammonia nitrogen:0~100/1000mg/L; Temp:0~50℃