The Apera EC400S (AI422) is a professional handheld water-quality meter designed for commercial cultivation, fertigation, and laboratory field testing. It measures electrical conductivity (EC), total dissolved solids (TDS), salinity, resistivity, and temperature, allowing operators to assess water quality and nutrient concentration using a single instrument. Its replaceable 2301T-S Brush-Resistant Platinum Black (BPB) conductivity electrode is designed to minimize electrode polarization and maintain consistent readings over repeated use.
With an EC measurement range of 0–200 mS/cm, the EC400S can test low-conductivity reverse-osmosis (RO) water, prepared nutrient solutions, and higher-strength feed solutions. Automatic temperature compensation adjusts EC readings for changing solution temperatures, while automatic calibration, probe self-diagnostics, and calibration reminders help maintain measurement reliability. Its IP57-rated housing is designed for demanding field environments, and the built-in GLP data logger stores up to 500 measurement records for later transfer to a Windows PC through USB. The USB connection also provides power for continuous operation at a fixed mixing or irrigation station.
• Product Type: Portable conductivity/TDS/salinity/resistivity meter kit
• Brand: Apera Instruments
• Model: EC400S
• SKU: AI422
• Measurement Parameters: EC, TDS, salinity, resistivity, and temperature
• EC Measurement Range: 0–200 mS/cm
• EC Accuracy: ±1.0% of full scale ±1 digit
• TDS Range: 0–100 g/L
• Salinity Range: 0–100 ppt
• Resistivity Range: 0–100 MΩ·cm
• Temperature Range: 0–80°C
• Temperature Accuracy: ±0.5°C ±1 digit
• Included Electrode: Apera 2301T-S BPB conductivity/temperature electrode
• Electrode Technology: Brush-Resistant Platinum Black (BPB), designed to minimize polarization and support stable conductivity readings
• Electrode Replacement: Replaceable probe; the meter body does not need to be replaced when the electrode reaches the end of its service life
• Temperature Compensation: Automatic compensation for EC measurements
• Calibration: Automatic 1–4-point calibration with standard recognition
• Calibration Management: Calibration reminders and probe self-diagnostics
• TDS Conversion Factor: User-adjustable from 0.40 to 1.00; factory default 0.71
• Measurement Conversion: TDS, salinity, and resistivity are calculated from the conductivity measurement; separate calibration for each is not required
• Data Storage: Up to 500 measurement groups using GLP data management
• Data Logging: Timed automatic measurement logging
• Data Export: USB connection to a Windows PC for stored-data transfer and real-time data capture
• USB Power: Supports continuous operation from USB power without relying on batteries
• Display: Large backlit LCD displaying EC and temperature simultaneously, with stability and calibration indicators
• Water and Dust Protection: IP57-rated housing, designed for dust-tight protection and temporary immersion up to 1 metre for 30 minutes
• Housing Design: Rubber-grip sleeve for handling in damp working environments
• Primary Applications: Source-water testing, nutrient-solution verification, reservoir monitoring, and runoff EC checks
• Suitable Growing Systems: Hydroponics, coco coir, rockwool, and commercial fertigation systems
• Included Calibration Solutions: Premixed conductivity calibration standards
• Primary Users: Commercial cultivation teams, fertigation operators, and water-quality technicians
Key Advantage: The Apera EC400S combines five water-quality measurement parameters with 500-record GLP data storage and USB data export in a rugged handheld instrument. Its broad EC range accommodates both RO water and stronger nutrient solutions, while the adjustable TDS conversion factor supports different nutrient-testing conventions. The replaceable BPB electrode reduces long-term replacement costs, and USB-powered operation allows the meter to serve as a stationary testing instrument at a nutrient-mixing or irrigation station.