APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy: Amazon.com: In

Apera Instruments AI209 Waterproof pH Meter: A Comprehensive Review

Accurate pH readings can be crucial in many professions, including agriculture, horticulture, lab work, and other related fields. The Apera Instruments AI209 Waterproof Ph Meter is a reliable, trustworthy tool that measures pH levels with great precision. This digital pH meter is a popular choice for professionals due to its many features.

Design and Build

This pH meter is waterproof and dustproof, with an IP67 rating. This rating indicates that the meter is impervious to dirt, dust, and sand. It can also withstand water immersion up to one meter deep for thirty minutes. It is lightweight and portable, making it easy for you to carry around.

The device includes replaceable probes that can be used to measure pH levels in different applications. Protective casings protect the probes from damage during storage and use.

Accuracy and precision

This pH meter is highly accurate and precise. It has a resolution of 0.01 pH and an accuracy of +0.01 pH. This precision is essential for professional applications that require accurate pH measurement.

The device has a reliable and stable reading, with a response time of less than three seconds. It can measure from 0 to 14 pH. This makes it suitable for many measurements.

Calibration and Maintenance

To ensure accurate pH measurements, calibration is required. The calibration solutions are easy to use to calibrate your meter. The device also features a self-diagnostic function that alerts you if there are any errors in the readings.

The device also features an automatic shut down feature that prolongs the battery’s life. The meter can run on four AAA batteries that can last up to 2000 hours.

Additional Features

The large LCD screen on the pH meter clearly displays the readings. The pH meter also features a hold function, which allows you to freeze the displayed readings for easy recording. The meter has an auto-recognition function that recognizes the buffer solution used to calibrate.

The case makes it easy to transport and store the device. The device also comes with a belt clip, which allows for hands-free operation.


  • High precision and accuracy
  • Design that is waterproof and dustproof
  • Easy to use calibration solutions
  • Rapid and reliable response
  • Battery life is long
  • Large LCD screen with hold function
  • Self-diagnostic feature
  • Auto-recognition buffer solution


  • Regular calibration is required
  • It may be more expensive than other pH meters


The Apera Instruments AI209 waterproof pH Meter is a reliable, accurate pH meter suitable for professional applications. It is durable and convenient thanks to its waterproof and dustproof design and interchangeable probes. This device is ideal for hydroponics, lab work, and other pH-related tasks.

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