The ProCon C500 is a corrosion-resistant single-screen controller for conductivity, resistivity, TDS, and salinity. Its modular design delivers first measurement values in under one minute. Built-in features include three 5A relay outputs, 4-20mA, and RS485 Modbus RTU communication—no extra modules required. The SimplCal feature enables fast one-minute calibration. A red alarm LED alerts out-of-bounds readings and indicates when sensor cleaning or replacement is needed. The 400-day datalogger includes trend chart display. Housed in an IP65-rated polycarbonate enclosure for heavy-duty applications. Mounting options: panel, wall, or pipe. Operating temperature -20 to 70°C. Applications include process control, water quality, sanitization systems, neutralization systems, effluent monitoring, pool/spa control, aquaculture, and cooling towers.