The Apera TDS20 (AI213) is a waterproof handheld tester designed for measuring total dissolved solids (TDS) in water and nutrient solutions. Its Brush-Resistant Platinum Black (BPB) conductivity sensor provides reliable readings across a 0–10,000 ppm range. Adjustable TDS conversion, automatic temperature compensation, and a stable-reading indicator make it suitable for checking RO water, nutrient concentrations, and irrigation runoff.
• Brand: Apera Instruments
• Model / SKU: TDS20 / AI213
• Measurement Range: 0–100, 0–1,000, and 0–10,000 ppm (0–10 ppt)
• Accuracy: ±1% full scale
• Sensor: Brush-Resistant Platinum Black (BPB) conductivity probe
• TDS Conversion Factor: Adjustable from 0.4 to 1.0
• Temperature Compensation: Automatic, 0–50°C; ±0.5°C temperature accuracy
• Calibration: Automatic 1–2-point calibration with buffer recognition
• Protection Rating: IP67 — waterproof, dustproof, and floatable
• Battery: 4 × AAA; up to 1,000 hours, with 8-minute automatic shutoff
• Included Accessories: 1,413 µS/cm and 12.88 mS/cm calibration solutions, batteries, lanyard, and carrying case
• Certifications: CE and RoHS; manufactured under ISO 9001:2015 quality system
Key Advantage: The TDS20 combines a wide 0–10,000 ppm range with adjustable 500/700-scale conversion and a durable BPB sensor. Its waterproof floating design makes it practical for daily nutrient-feed, source-water, and runoff testing.