WPA CD640 Digital PH meter

• Monitoring pH levels in laboratory samples for research and quality control.
• Ensuring correct pH balance in pharmaceutical production processes.
• Analysing water quality in environmental testing and treatment facilities.
• Controlling pH in food and beverage manufacturing for product consistency and safety.
• Educational purposes in science laboratories for practical demonstrations and experiments.

Typical measurement range

Typically 0 to 14 pH, with resolution commonly around 0.01 pH.

Power supply

Often battery-operated for portability (e.g., 9V PP3) or mains powered via an AC adapter (e.g., 230V UK standard).

Display type

Commonly features a clear LCD digital display for easy reading of pH values.

Calibration

Typically requires 1, 2, or 3-point calibration using standard buffer solutions.

Temperature compensation

Many units offer manual or automatic temperature compensation (ATC) to ensure accuracy across varying sample temperatures.

Electrode type

Typically uses a combination glass electrode, often replaceable.

• What is the typical accuracy of a digital pH meter like the CD640?

  For this class of equipment, accuracy is commonly around ±0.01 to ±0.02 pH units, depending on calibration and electrode condition.

• Does this unit come with calibration solutions?

• What maintenance does a digital pH meter require?

• Is the electrode included with the meter?

• Can this meter be used for continuous monitoring?

pH meters and sensors attract strong buyer interest in laboratory, biotech and pharmaceutical settings. Industry consensus values accuracy, calibration stability and sensor longevity as critical factors. Used units typically offer good value if maintained properly. Buyers prioritise checking calibration history, electrode condition and display functionality before purchase. Reputable brands retain performance well. Common strengths include reliable readings in controlled environments and straightforward operation, though sensors require regular maintenance and occasional replacement to sustain accuracy standards.

General overview for this equipment type