This article answers the most common questions around pH meters & accessories.

If you work in food processing or preparation, it is likely that pH testing is a critical part of your quality control process. After all, the pH of a product or ingredient directly affects taste, texture, appearance, consistency, and safety.

In this guide, we explore everything you need to know about pH meters and their accessories. You’ll find practical insights in every section, or you can use the links below to jump straight to the topic most relevant to your site.

What is a pH meter and how does it work?

What accessories accompany a pH meter?

How do I take care of my pH meters?

How do I calibrate my pH meters?

Why pH Matters in Food Production

Even small variations in pH can significantly impact product quality. For example, if yoghurt falls outside its recommended pH range, the result may be excessive tartness and discolouration.

In products such as wine, inconsistent pH levels from batch to batch can lead to unreliable flavour and texture, ultimately damaging customer trust and brand reputation.

Most importantly, pH plays a vital role in food safety. Many production sites rely on maintaining a low pH to inhibit the growth of harmful bacteria. If readings are inaccurate or overlooked, the consequences can be severe, potentially leading to serious illness or even fatality.

What is a pH meter and how does it work?

A pH meter measures the acidity or alkalinity of a solution on a scale of 0–14. Readings below 7 indicate acidity, readings above 7 indicate alkalinity, and a value of 7 is neutral.

In food and beverage production, pH meters are essential quality control tools. They help ensure products meet target specifications, remain consistent between batches, and comply with safety requirements.

pH reflects the activity of hydrogen ions in a substance. The higher the hydrogen ion activity, the lower the pH value. Because temperature affects pH readings, measurements should be taken at a controlled reference temperature or with a meter that offers automatic or manual temperature compensation. Without accounting for temperature, results may be inaccurate.

Choosing the Right pH Meter for Your Application

With a range of pH meters available, selecting the right one for your site can be challenging. The three main options each have their strengths and are suited to different applications:

  • pH Pocket Testers: Small, portable, and easy to use, these are ideal for quick checks and low-risk screening across the factory floor.

  • Handheld pH Meters: Offering higher accuracy and multi-point calibration, these are best suited for routine QA testing, in-process checks, and production control.

  • Benchtop pH Units: Providing the highest precision, advanced features, and data logging, these units are designed for laboratory analysis, method validation, and applications where defensible data is required.

Below is a quick comparison table to help you evaluate the key features of each type:

Feature Pocket pH Tester Handheld pH Meter Benchtop pH Meter
Portability Very high High Low
Accuracy Low–moderate Moderate–high Very high
Calibration Basic Multi-point Advanced / GLP
Typical user Operators QA / Technical Lab / R&D
Audit suitability Limited Good Excellent
Cost £ ££ £££
Best for Quick checks, low-risk screening, portability Routine QA testing, production control, audit-relevant checks Laboratory analysis, high accuracy, method validation

For more detailed guidance on selecting the right meter, see our full article on choosing a pH meter for your application.

Read the complete article

What accessories accompany a pH meter?

Selecting the right pH meter is only part of the equation. Proper storage, calibration, and maintenance require the correct supporting materials. Equipping your team with the right accessories protects your equipment, improves measurement reliability, and supports efficient production. Below are the key accessories to consider.

pH Electrodes

Different applications require different electrode designs, and selecting the correct type will improve accuracy, durability, and response time.

There is a wide range of options available. For example, electrodes designed for high-sugar, semi-solid products and liquids at elevated temperatures are ideal for jams and preserves. Similarly, penetration electrodes (often with a knife tip) are designed to penetrate the tough exterior of semi-frozen meat and fish.

Explore the complete range of pH Electrodes

pH Buffer Solution

Accurate calibration requires at least two buffer solutions. A neutral buffer (pH 7) is essential, alongside a second buffer that closely matches the typical pH of the products you test.

For greater accuracy across a wider measuring range, a third buffer at the upper or lower end of that range may also be used.

Buffer solutions are commonly available at pH 1.68, 2, 4, 7, and 10, with dosing bottles available to support efficient and controlled use.

Explore the complete range of pH Buffer Solutions

pH Electrode Cleaning Solution

Using a suitable pH cleaning solution helps extend the life of your pH electrodes and maintain accurate readings.

It removes contaminants from the glass membrane and junction, ensuring fast response times and reliable measurements. Cleaning should be performed before and after calibration to prevent residue from compromising results and to verify that your equipment is functioning correctly.

Explore the complete range of pH Electrode Cleaning Solutions

pH Electrode Refill Solution

If the reference electrolyte in your electrode drops, it can compromise the accuracy and reliability of your pH measurements. Maintaining the correct electrolyte level is therefore essential for consistent results.

For electrodes with a replaceable liquid junction, topping up with a potassium chloride (KCl) refill solution restores the reference electrolyte, helping to maintain optimal performance, extend electrode lifespan, and ensure accurate readings over time.

Explore the complete range of pH Electrode Refill Solutions

pH Electrode Storage Solution

Most electrodes spend more time in storage than in use, so proper care during this period is essential. Using an electrode storage solution keeps the glass bulb and junction of your pH electrodes hydrated, helping to maintain fast response times and accurate measurements.

Proper storage also prevents clogging, reduces the risk of damage, and extends electrode lifespan, supporting consistent measurement quality and improved operational efficiency.

Explore the complete range of pH Electrode Storage Solutions

How do I take care of my pH meter?

Proper care is the key to extending the lifespan of your pH meter and ensuring accurate, reliable measurements. To achieve this, make sure your team:

  • Is trained to use the meter correctly
  • Stores the equipment safely
  • Performs regular checks to verify accuracy

The following seven tips cover cleaning, storage, and maintenance best practices.

Cleaning

  • Soak in cleaning solution: Leave the electrode in a suitable cleaning solution for up to 30 minutes before transferring it to storage. This is especially important after testing high-protein products, such as mayonnaise, which can block the electrode junction over time.
  • Remove surface residues carefully: If additional cleaning is needed, gently dab the electrode with a soft tissue soaked in mild detergent or methyl alcohol. Avoid wiping the glass directly.

Storage

  • Keep electrodes wet: Electrodes should always remain hydrated when not in use.
  • Use proper storage solutions: For short- to medium-term storage, soak electrodes in an Electrode Storage Solution. For long-term storage, use a soaking boot filled with Electrode Storage Solution, pull it over the electrode tip, and seal with parafilm.

Maintenance

  • Avoid inappropriate liquids: Never store electrodes in deionised water, sample liquids, solvents, hydrofluoric acid, or pH buffers containing mercury-based preservatives.
  • Inspect the glass membrane: Regularly check the sensitive glass bulb for cracks or chips. Never touch it with your fingers, and keep it away from oily or abrasive surfaces.
  • Maintain the reference cell and connectors: Keep reference cells topped up with Electrode Refill Solution, and ensure connectors remain clean and dry.

How do I calibrate my pH meter?

Regular calibration is essential for extending the lifespan of your equipment and ensuring accurate measurements. This is typically done using two or more buffer solutions that match your testing range. The video below provides a step-by-step guide to calibration.

Alternatively, if you prefer written instructions or want to learn more about validating your equipment, click the button below.

Step-by-step Instructions

We hope this guide has given you a clear understanding of pH meters and their accessories. With this knowledge, you should be able to establish a solid plan for using, maintaining, and calibrating your equipment.

However, if there are any areas where you would like further guidance, the Klipspringer team would be happy to help you with your enquiries. Simply contact our team on 01473 461800 or sales@klipspringer.com. Alternatively, you can fill out the form below.  

If you would like further guidance relating to pH meters, the Klipspringer team would be happy to help. Share your details below to arrange a free consultation.