The Apera PC400S (AI423) is a professional handheld meter that measures six water-quality parameters: pH, electrical conductivity (EC), total dissolved solids (TDS), salinity, resistivity, and temperature. Its two included electrodes support comprehensive testing of source water, nutrient solutions, and runoff. With USB data output, 1,000-record GLP data logging, and IP57-rated protection, it is designed for commercial fertigation and routine water-quality monitoring.
• Brand: Apera Instruments
• Model / SKU: PC400S / AI423
• Measurement Parameters: pH, EC, TDS, salinity, resistivity, and temperature
• pH Range / Accuracy: −2.00 to 19.99 pH / ±0.01 pH ±1 digit
• EC Range / Accuracy: 0–200 mS/cm / ±1% full scale ±1 digit
• Included Electrodes: 201T-S pH/temperature electrode and 2301T-S BPB conductivity/temperature electrode
• Calibration: Automatic 1–5-point pH calibration and 1–4-point EC calibration
• Data Storage: 1,000 records with measurement values, units, temperature, date, and time
• Connectivity: USB data export; includes PC-Link software for Windows
• Power Supply: 4 × AA batteries or USB power
• Protection Rating: IP57 — dustproof and rated for temporary water immersion
• Included Accessories: Two electrodes, six premixed calibration-solution bottles, USB cable, software, and rugged carrying case
Key Advantage: The PC400S combines six water-quality measurements with 1,000-record data logging and USB export. Its wide EC range and rugged waterproof design make it useful for checking source water, nutrient batches, and runoff while maintaining traceable quality-control records.