The Apera PH20 (AI209) is a compact, waterproof pH tester designed for routine nutrient-solution monitoring in commercial cultivation facilities. It provides ±0.1 pH accuracy with automatic temperature compensation and stable-reading recognition. Its IP67-rated housing makes it suitable for daily testing of nutrient reservoirs, irrigation water, and runoff. (Hydro Supply Co.)
• Brand: Apera Instruments
• Model / SKU: PH20 / AI209
• pH Range / Accuracy: 0–14 pH / ±0.1 pH
• Resolution: 0.1 pH
• Temperature Compensation: Automatic (ATC), 0–50°C
• Calibration: Automatic 1–3-point calibration at pH 4.00, 7.00, and 10.00
• Protection Rating: IP67 — waterproof and dustproof
• Battery Life: Up to 2,000 hours using 4 × AAA batteries
• Additional Features: Stable-reading recognition, electrode self-diagnosis, and automatic shutoff after 8 minutes
• Included Accessories: pH 4.00 and 7.00 calibration solutions, AAA batteries, lanyard, and rugged carrying case
• Warranty: 2 years for the meter; 6 months for the probe
• Measurement Limitation: ±0.1 pH accuracy makes it less suitable for applications requiring high-precision measurements.
Key Advantage: The PH20 offers simple, durable pH testing for everyday cultivation operations. Its IP67 protection, long battery life, and automatic calibration make it practical for frequent reservoir and runoff checks, although the Premium PH60 is a better choice when ±0.01 pH accuracy is required.