Portable Digital Water pH Meter Pen – LCD Display, 0-14.0 Range, Auto Calibration for Aquarium & Pool

Ensure precise and effortless water-quality monitoring with this high-precision digital pH meter pen. Featuring a full 0-14.0 pH range, clearly readable LCD display and automatic calibration, it’s designed for anyone who needs reliable readings - whether you’re maintaining an aquarium, balancing pool or spa water, managing hydroponics systems, or performing lab experiments.

Built with a premium glass-bulb electrode and properly engineered electronics, this compact pen-style tester delivers professional-grade accuracy in a portable format. Digital meters like these outperform test strips or color charts by offering greater consistency and repeatability in field or home environments.

Key Features

• Fast & Accurate Readings – Operates with a resolution of 0.01 pH and typical accuracy up to ±0.01 pH, delivering quick and trustworthy results.
• Simple to Use – Just immerse the electrode into the solution and read the value on the backlit LCD screen. No guess-work.
• Automatic Calibration – One-button calibration with included buffer powders (e.g., pH 4.00, 6.86, 9.18) ensures ongoing accuracy and simplifies setup.
• Wide Application Scope – Ideal for use in aquariums, swimming pools, spas, hydroponic growth systems, drinking water testing, schools, laboratories and more.
• Portable & Compact – Pocket-size pen design and lightweight construction mean you can carry and use it easily anywhere for on-the-go water testing.
• Durable Design – ABS body paired with the precision glass electrode gives robust performance in everyday use and field settings.

Calibration Instructions

1. Prepare buffer solutions at pH 6.86, pH 4.00 or pH 9.18 as indicated.
2. Immerse the electrode in a buffer; hold the CAL button for approx. 5 seconds until the display flashes the calibration value.
3. Wait until the reading stabilizes, then rinse the probe and repeat with additional buffer levels if required for multi-point calibration.
4. Re-calibrate whenever the meter has been unused for long periods, after battery replacement, or if readings seem inconsistent/unreliable.
   Note: Performing regular calibration and proper electrode care are key to maintaining accuracy.

Whether you’re a home aquarium enthusiast, pool/spa owner, hydroponic grower or a lab user, this pen-style meter offers a balance of professional-level features and portable convenience — so you can test wherever and whenever water quality matters most.