Apera Instruments PH20 Value pH Meter

Get accurate, hassle-free pH testing on the go with the Apera Instruments PH20—a top-rated, value-packed waterproof pocket pH meter trusted for reliable everyday measurements in reverse osmosis systems, hydroponics, aquariums, pools/spas, water treatment, brewing, winemaking, and more.

This compact tester offers ±0.1 pH accuracy across 0–14.0 range, with automatic temperature compensation (ATC) from 0–50°C and smart auto-recognition of stable readings (smiley face indicator)—no more guessing or manual holding. It auto-calibrates up to 3 points (buffers recognized automatically) for quick setup and consistent results.

The ultra-clear 180° viewing screen displays dual pH/temperature readouts, calibration status (L/M/H icons), and stability confirmation. Powered by AAA batteries for up to 2000 hours of use, with low-battery warning and auto-off after 8 minutes.

IP67 waterproof and dustproof (floats if dropped in water), plus smart self-diagnosis for out-of-range or calibration errors—built tough for real-world use.

Important Notes for RO & Pure Water Users The PH20 performs best in solutions with sufficient ions (e.g., tap, remineralized RO, hydroponic nutrients). It may not give stable/accurate readings in distilled, deionized, or ultra-pure RO water (low conductivity). For pure water pH testing, consider specialized low-ionic electrodes. Never store the probe in distilled/deionized water—use pH 4 storage solution or electrode storage liquid to protect the glass membrane.

Key Benefits

• Reliable & easy — Auto calibration, ATC, and stable-value smiley face for repeatable results without guesswork.
• Clear & user-friendly — Large backlit screen with dual display and calibration indicators.
• Durable & portable — Waterproof, floats, rugged case; long battery life.
• Great value — Complete kit with premixed buffers (pH 4.00 & 7.00), batteries, lanyard, and carrying case.
• Versatile — Perfect for checking remineralized RO output, aquarium stability, hydro nutrient solutions, or brewing mash/wort pH.

Specifications

• pH Range: 0–14.0
• Accuracy: ±0.1 pH
• Resolution: 0.1 pH
• Temperature Compensation: Automatic (0–50°C / 32–122°F)
• Calibration: Auto 1–3 points with buffer recognition
• Display: LCD with dual pH/temp, stability icon (smiley), calibration indicators
• Power: 4 × AAA batteries (up to 2000 hours continuous)
• Waterproof Rating: IP67 (floats)
• Probe: Glass bulb electrode
• Warranty: CE certified; 6 months on probe
• Manufacturer: Apera Instruments (ISO 9001:2008 compliant)

What's Included

• PH20 pH meter
• Premixed calibration solutions (pH 4.00 & 7.00)
• AAA batteries
• Lanyard
• Portable rugged carrying case

Recommended Use & Maintenance

• Calibrate before first use and every 1–2 weeks (or after heavy use) with provided buffers.
• Rinse probe with distilled water after measurements; store in proper storage solution (not distilled water).
• Replace probe as needed (6-month warranty).
• For RO systems: Ideal for monitoring post-remineralization pH (~6.5–8.5 target).

This bestselling Apera PH20 delivers professional-grade accuracy in a pocket-friendly package—perfect for Osmotics RO users ensuring optimal remineralized water quality. In stock with fast UK delivery (next-day options available). Add calibration buffers or storage solution for long-term reliability.