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This digital pH meter pen offers precise and reliable measurements with a high accuracy of ±0.01 across a full 0–14 pH range. Compact and pocket-sized, it is pre-calibrated and ready to use for testing the pH of drinking water, pools, aquariums, and hydroponic systems. Designed for ease of use and portability, it is an essential tool for maintaining optimal water quality in various environments.

The Ruolan brand logo represents a trusted name in water testing solutions. This banner reflects the commitment to quality and innovation behind the Digital pH Meter Tester Pen, ensuring users receive a dependable product with every purchase.

Close-up view of the pH meter pen showcasing its compact design and clear LCD display. The sturdy probe ensures accurate and quick readings for a variety of water testing applications.
Test item: water pH value
Working environment: 0-80℃, RH < 95%
Measuring range: 0.00-14.00 pH
Automatic temperature compensation: 0-80℃
Calibration function: two-point automatic calibration
Application scope: hydroponics, laboratory, pool, industrial water treatment, water purifier

Essential pH meter for water testing, ideal for diverse uses from aquariums to hydroponics. Its ergonomic pen-style design ensures portability and ease of handling in daily measurements.

Calibration sequence reminder illustration. It is crucial to follow the calibration steps in the order of 6.86, 4, then 9.18 pH for accurate meter functionality and minimal error tolerance.
Please note this product’s glass probe is fragile. Avoid collisions or dropping as damage is irreversible. After use, gently absorb moisture on the probe tip with absorbent paper to maintain longevity and accuracy.
Calibration powder is a solid pH standard substance that must be dissolved in purified or distilled water to prepare the calibration solution. Avoid using tap or mineral water as it reduces accuracy.
Each packet requires 250 ml of purified water. Proper proportion is essential to ensure minimal calibration error and optimal meter precision.

High-resolution image showing the pH meter in action with water, illustrating the sleek design and functional display. Perfect for quick and accurate water quality assessments.
If the backlight dims significantly or the display becomes unclear, replace the battery promptly.
Simply pull out the battery compartment to change it. Ensure that the battery polarity is correct during replacement for optimal performance.