Do You Need A pH Meter For Cheese Making?


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Whether making DIY cheese or working in a commercial cheese factory, testing the pH levels ensures consistent results and a safe end product for sale or personal consumption. The ideal pH for most cheese types ranges between 5.1 and 5.7. To maintain pH levels, a pH meter is used. These are easy to use and provide accurate results for cheese making. 

If you’re an avid cheese lover and have considered making your own cheese at home, you may have heard about the importance of using a pH meter during the cheese-making process. But the question remains: do you really need one?

While some cheese makers swear by the use of a pH meter, others argue that it’s not necessary and can even be a hindrance to the cheese-making process. In this article, we’ll explore why you need a pH meter for cheese-making.

So whether you’re a seasoned cheese maker or just starting out, keep reading to learn more about the role of pH meters in cheese making.

What Is The Cheese Making Process?

Cheese is one of those foods that almost everyone loves, and it is used in countless dishes around the world. But have you ever wondered how it’s made? The cheese-making process is a fascinating one, and it involves a combination of science, art, and tradition. 

The first step in the cheese-making process is to choose the milk that will be used. Most cheeses are made from cow’s milk, but others can be made from goat’s milk, sheep’s milk, or even buffalo’s milk. Once the milk is chosen, it is heated to a specific temperature and then a starter culture is added. This culture contains bacteria that help to acidify the milk and give it the characteristic flavor of cheese.

After the starter culture is added to the mixture, rennet is added to the milk. Rennet is a complex set of enzymes that causes the milk to coagulate, or thicken. This is the point where the milk turns into curds and whey. The curds are then cut into tiny pieces and stirred to expel more whey.

At this point, you may want to add salt or other seasonings to the cheese. This gives the cheese its final flavor. The cheese is then placed into molds and pressed to remove the last of the whey. The amount of time the cheese is pressed depends on the type of cheese being made.

Once the cheese has been pressed, it is left to age. This is where the science and art of cheese-making come together. You must control the temperature and humidity of the aging room to ensure that the cheese develops the proper flavor and texture. This is easily managed using a humidity and temperature sensor. Some cheeses are aged for just a few days, while others are aged for weeks, months, or even years.

What Are The Differences Between Commercial Cheese Making And DIY Cheese Making?

Cheese-making is an age-old tradition that has been practiced for centuries across the globe. While the basics of cheese making remain the same, the processes used in commercial cheese making and DIY cheese making can vary significantly.

Commercial cheese-making is a highly streamlined and mechanized process that is geared toward producing large quantities of cheese quickly and efficiently using advanced equipment and technology. In contrast, DIY cheesemakers typically make cheese in smaller batches using basic equipment that can be found in most kitchens. DIY cheese-making is also a more hands-on and personalized approach that allows for greater experimentation and creativity.

Another major difference between commercial cheese making and DIY cheese making is the ingredients used. Commercial cheese makers often use a standardized set of ingredients to produce cheese that meets specific flavor and texture profiles. DIY cheese makers, on the other hand, have the freedom to experiment with different ingredients and flavor combinations to produce unique cheeses.

The cheese-making process itself can also differ between commercial cheese making and DIY cheese making. Commercial cheese makers often use a highly complex process that involves pasteurization, homogenization, and other steps to ensure consistent quality and safety. DIY cheese makers, on the other hand, may use more traditional methods that involve heating milk, adding cultures and rennet, and allowing the cheese to age naturally.

What Role Does pH Have In Cheese Making?

The potential of hydrogen (pH) plays a vital role in the cheese-making process, as it determines the texture, flavor, and quality of the final product. pH is a measure of acidity or alkalinity, and it is measured on a scale of 0 to 14, with 7 being neutral. The pH of the milk is critical at every stage of the cheese-making process, from the initial curdling to the final aging.

During the first stage of cheese making, the milk is heated and then inoculated with bacteria or lactic acid. The pH of the milk at this stage is around 6.5 to 6.8, which is slightly acidic. As the bacteria or lactic acid ferment the milk, the pH drops and the milk becomes more acidic. This acidic environment is necessary for the milk proteins to coagulate and form curds, which are then separated from the whey.

After the curds have formed, they are cut and then heated again. The pH of the curds at this stage is critical, as it determines the texture of the cheese. If the pH is too low, the cheese will be dry and crumbly. If the pH is too high, the cheese will be soft and mushy.

Once the curds have been cut and heated, they are drained and then pressed into molds. The pH of the cheese at this stage is important as well because it determines the flavor of the cheese. The pH of the cheese can be adjusted by adding salt or acid. The addition of salt lowers the pH, while the addition of acid raises the pH. The ideal pH for most cheese types ranges between 5.1 and 5.7. 

Finally, the cheese is aged, which further affects the pH and flavor of the cheese. During aging, the pH of the cheese drops, and the flavor becomes more complex. The ideal pH for aged cheese is around 4.5 to 5.3.

How To Test The pH Of Cheese?

The pH of cheese can be tested using a pH meter or litmus paper. A pH meter is a more accurate and reliable method of testing the pH of cheese, which is why commercial cheese-making processes always opt for a pH meter. 

A pH meter uses a pH-sensitive electrode and a reference electrode to measure the electrical potential difference.

Alternatively, litmus paper can also be used to test the pH of cheese, and this is more common with small DIY cheese-making processes. Litmus paper is a strip of paper that changes color depending on the pH of the substance being tested.

  • To test the pH of cheese using litmus paper, a small amount of the cheese sample is mixed with distilled water to create a slurry. 
  • The litmus paper is then dipped into the slurry, and the color change is observed.

What pH Meter Is Best For Cheese Making?

When making cheese, a pH meter monitors the pH levels of the milk during the curdling process. But with so many pH meters available in the market, which one is the best for cheese making? There are two types of pH meters: digital and analog. Digital pH meters are more accurate and easier to read, while analog pH meters are cheaper but less accurate. 

When choosing a pH meter for cheese making, accuracy is key. Look for a pH meter with a high level of accuracy, preferably within 0.01 pH units. The pH meter should also be easy to calibrate and use, with a clear and easy-to-read display. A waterproof and durable casing is also important, as cheese-making can be a messy process!

Some popular digital pH meters for cheese making include the Consumer Grade pH Probe, which gives high-accuracy readings over a wide pH range, and also, interference-free readings.

However, if you are working with harder slurry cheeses, a Spear Tip pH Probe is good for stabbing and it works great for reading the pH, despite it looking slightly different than a Lab Grade pH probes.

For long-term cheese-making or commercial cheese factories, you may want to consider a larger probe such as the Industrial pH Probe, as it has a life expectancy almost twice as long as a Lab Grade Probe. Unlike traditional pH probes that have a glass bulb at their tip, the Industrial pH Probe has a flat sensing area, so you never have to worry about the glass breaking off into your cheese. 

Ultimately, the best pH meter for cheese making depends on your specific needs and budget. Invest in a high-quality pH meter, and you’ll be on your way to making delicious cheese every time.


Making cheese is a complex and fascinating process. pH is an essential factor in cheese making that cannot be overlooked. It is a critical aspect that impacts the texture, flavor, and overall quality of the cheese. By carefully monitoring and adjusting the pH throughout the cheese-making process, you can ensure that your cheese is both delicious and safe to eat.

If you have any questions regarding the pH of your cheese-making process, or which pH probe will be best for your cheese-making needs, do not hesitate to contact the world-class team at Atlas Scientific.

pH Probes & Sensors

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