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Best Extech pH Meters Review – Why This Company Stands Out?

If your goal is to get maximum yield, there are certain points you have to keep in mind. Taking proper care of aeration, lighting, and providing nutrients is vital.

However, taking care of pH levels is also very important. pH defines the alkalinity of the acidity of any substance. In the case of home growing, proper levels of pH are critical for plant health and the desired yield.

Some plants are very sensitive to the pH levels of nutrients provided for them. For maximum yield, a gardener needs to keep track of the pH levels in both soil-based and hydroponic systems.

Extech is a company providing test and measurement tools for the last 48 years. Their tools are sold in over 100 countries. Their products are equally helping professionals and beginners.

Out of many pH meters available in the market, the ones sold by Extech are known for their best performance. Here in this article, we provide reviews of the Best Extech pH meters, so you can pick one of them according to your needs!

Waterproof pH Pen PH50 by Extech

Extech PH50 Waterproof pH Pen

What we liked most about this product

This compact ph meter can check ph levels of either garden soil or your hydroponic system. The LCD on this ph meter displays readings clearly, and the three buttons on this meter allow you to take readings easier than ever. Low battery indication and the ability to hold readings make this pen stand out as the best ph pen in the market.


Extech PH50 ph pen is capable to meet the needs of any home grower or a professional gardener. This ph meter is capable of measuring pH levels that are between 2 and 12 pHs.

It is durable, and you can get the most out of this pen ph meter. It is very helpful if a ph meter can work in water, and this one has an IP67 rated outer casing.

The IP67 rating is an industry-standard to recognize such electrical devices that work in water, and this ph meter is ready to take readings in wet conditions.

The most hectic task with ph meters is calibrating them. Ph meters want regular calibration, and many meters are not easy to adjust. However, this device comes with the “CAL” button. Using it, you can calibrate your pen ph meter with a single keypress. It works on the principle of automatic buffer recognition. Holding “PWR” turns this pen ph meter on and off.

Automatic buffer recognition allows this pen pH meter to be calibrated easily. The reason to use a ph meter is to record the values of ph for better understating. This one can store data being displayed on LCD for a certain time so you can note down the ph value.

This ph meter is waterproof and provides outstanding results. The net weight of this pen ph meter is only 65 grams, which equals to only 2.30z.

This ph meter is very easy to use. You do not have to match your results with some color schemes to measure the ph as this device comes equipped with a readable LCD. LCD technology is very easy to read and provides the same performance over the years to come.

Talking about its interface, there are not many buttons that can leave you worried. Only a handful of buttons are placed on this pen ph meter for user-friendly controls. There are only 3 buttons on this ph meter. One is for powering up the device, the second one is to calibrate your ph meter, and the third one is to freeze the readings being displayed.

For professional uses like measuring the ph of garden soil, you can use this pen ph meter without worrying about the authenticity of the results.

What’s great about this ph meter is that you don’t have to calibrate it daily. Calibration of this product is as long-lasting as the meter itself.

You can use this ph meter without worrying about its durability. It is one of the best ph meters made by Extech, having positive reviews from customers of every walk of life.

Along with many powerful features, an auto power-off feature is also included – it works perfectly to save the battery. This pH Pen also comes with a built-in electrode, making it able to start working as soon as it comes to you.

A sensor cap is also present on this meter. The inner pH electrode protection cap makes this device durable. The four LR44 button batteries are easy to swap and provide outstanding performance.


  • The pH range of this meter is from 2 to 12pH.
  • The LCD on this device displays pH readings.
  • Very easy to calibrate with the single CAL key.
  • The automatic pH buffer recognition works with 4, 7, and 10pH.
  • You can have 3 point calibration to provide maximum accuracy.
  • The data measured with this device is frozen on the display to take readings easily.
  • The Low battery indicator and auto power-off feature provides the best performance.
  • The built-in electrode, a sensor cap, and the inner pH electrode protection cap couples to provide outstanding results.
  • LR44 button batteries are easy to replace.


  • The calibration of this ph pen is not up to the standards.

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Exstik PH100 ph meter by Extech

Extech PH100 ExStik pH Waterproof Meter

What we liked most about this product

This ph meter is not like the conventional ph meters. It is coupled with rugged features to ensure high performance for years to come. The LCD on this ph meter ensures outstanding visibility of the results.


This ph meter is waterproof, which is a feature you do not find in many ph meters. Along with its waterproof exterior, it is also extremely accurate to provide reliable results.

While litmus paper to find the ph is not reusable, this device can be reused to measure the ph levels. The best thing about this product is its specific data storage capability.

The ease of use enhances the experience with this ph meter. While other ph meters are only capable to measure the ph of liquids, this ph meter can measure the ph of semi-solids and solids as well.

This enhanced power of measuring ph comes from the flat surface electrode. While other electrodes are prone to breakage and clogged junctions, this flat surface electrode is not vulnerable to these events.

In every ph meter, you have to put new electrodes. While it is not easy to check when the electrode needs replacement, the renew indicator on this meter indicates when it’s time to replace the electrode.

Along with the replacement indicator, there is also a CAL alert in this meter. The CAL alert tells you when you have to recalibrate your ph meter.

The memory of a ph meter is the most important feature. In this ph meter, you do not have to note down your readings on paper. A memory feature in this ph meter is capable of recording and storing the last 15 readings taken in a sequence. This allows you to check whether your medium has made any ph changes or not.

The LCD simultaneously shows pH and temperature. The automatic temperature compensation and auto power-off are also present in this meter.

There are no complications in using this ph meter. Proper storage and proper calibration are the only rules you need to follow.

The quality of this product is outstanding, and following the given instructions allows you to take perfect readings. Another good thing is that reagent tablets are shipped with this ph meter.


  • The smart chip of this meter provides maximum performance.
  • The renew features notifies you to replace the electrode.
  • CAL feature notifies you to recalibrate your meter.
  • It is waterproof with a flat surface electrode to work best in harsh conditions.
  • Automatic Temperature Compensation is used in this meter for measuring temperature.


  • Calibration and build quality of this product should have been better.

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PH110 ph meter by Extech

Extech PH110 Extech PH110 ExStik Waterproof pH Meter; Refillable

What we liked most about this product

This model has rugged built quality, suitable for those who want a long-lasting ph meter. The electrode in this meter is flat-surfaced and refillable.


Checking ph with a litmus paper is a thing of the past now. Unlike other ph meters, it comes with a flat surface refillable electrode. This type of electrode enables one to measure the ph of liquids, solids, and semi-solids at the same time.

 You can also measure the ph of many cosmetic products using this ph meter.

The flat surface electrode is not easily breakable like the other electrodes. This ph meter is very durable. What adds more to the durability of this ph meter is its waterproof build.

Refilling allows this electrode to work for a long time.

You can use this ph meter to check both the ph of your pool water and the ph of the garden soil. Hydroponic gardens are sensitive to even small changes in ph. Therefore, it is very important to maintain the proper ph levels for plants’ growth in such systems.

This ph meter ships with a 1.5mL bottle of KCI. A total of two reference junctions and two removal tools are also present in this ph meter package.


  • The refillable electrodes provide maximum ease to the users of this ph meter.
  • Refilling the electrode is fast and very easy.
  • Electrode shelf life is not a problem with this ph meter.
  • With a separately buyable ph buffer solution, the performance gets increased.


  • Build quality of this product is not good.

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Palm pH meter PH-220C by Extech

Extech PH220-C Waterproof Palm pH Meter with Cabled Electrode

What we liked most about this product

Most of the ph meters in the market are not very easy to hold and carry out the readings. However, if you are looking for the most portable solution for taking ph measurements, this palm-held ph meter by Extech is the perfect device for you.


With a size that can be easily fitted in a palm, you can take this ph meter anywhere to measure ph levels. The portability of this product does not make it difficult to use.

You can operate this ph meter without any hassles at all. Every ph meter needs an electrode to measure the ph, and this one is equipped with a 1m polycarbonate electrode.

The meter is equipped with an LCD to show the results with extreme clarity. This device is capable of measuring pH, mV, and temperature at the same time.

There is a powerful microprocessor embedded in this ph meter, and it is capable of performing automatic buffer recognition. Automatic temperature compensation with the help of the built-in electrode is also one of the main powers of these microprocessors.

A great thing is that it can store 25 readings at a time for future reference. There are many situations when you cannot perform calculations at the same time of taking them, and the saving feature comes handy.

You might need to use this meter without holding it, and doing so is easy with the magnetic back to mount it on a wall.

Another quality of this ph meter is its waterproof exterior. You can use it in water without worrying about its well-being.

It is capable of measuring ph values between 1 and 13 pH. In most of the laboratory uses, you can depend on this ph meter to receive accurate results. This ph meter comes with two sachets of buffer solution, and you can buy extra sachets for hassle-free readings.

Unlike the old pH meters present in the market, calibration of this ph meter is not difficult at all. The only thing you have to do is to press a calibration button. By pressing only one button, you can calibrate this ph meter anywhere and anytime.


  • A large LCD of this hand-held ph meter is capable of showing ph and mv at the same time.
  • The automatic buffer recognition of these devices comes with its microprocessor.
  • The memory capable of storing 25 readings.
  • Automatic Temperature Compensation.
  • Completely waterproof.
  • Low Battery indicator and Automatic Power off feature.
  • Cabled pH electrode included.
  • A protective holster provides outstanding protection.
  • pH buffers and a 9V battery.


  • This ph meter is not waterproof like the other ones.

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Waterproof ph meter PH300 by Extech

Extech PH300 Waterproof pH Temperature Kit

What we liked most about this product

Out of the many compact ph meters in the market, this one has the feature of measuring pH, mV, and temperature at the same time. The build quality of this one is very solid, and you do not have to worry about breaking it anytime soon.


Not many devices in the market are capable of taking 3 measurements at a time, like this one. With this ph meter, you can measure the pH, temperature, and MV at the same time.

This ph meter can be calibrated to 4, 7 and 10 ph with just one press of a button. This calibration allows you to have better accuracy in your readings. Another awesome feature of this ph meter is automatic temperature compensation.

The Memory of this pH meter is capable of storing up to 200 readings at a time. What’s more exciting is that these measurements come with a series number, and a measurement of temperature as well.

On this ph meter, there is a large LCD of blue color to show the results with great visibility.

The auto power-off function ensures that your ph meter has long battery life. Another exciting thing about this ph meter is its IP57 waterproof housing. This housing protects the ph meter from water and other fluids.

This ph meter comes with a pH/mV/temp electrode to provide the best results. A protective rubber holster ensures maximum protection.

This ph meter operates on two AA batteries to provide an easy power solution. The hard carrying case ensures further safety, and the user manual also comes in handy.

This pH meter features a pH probe with cable, a couple of batteries, and calibration ph buffers to provide maximum accuracy.


  • Measuring pH, mV, and Temperature at the same time with ease.
  • You can enjoy Automatic calibration at 4, 7, and 10pH on this ph meter.
  • 3 point calibration ensures that you have better accuracy.
  • Automatic Temperature Compensation on this ph meter is a great feature.
  • You can store 200 readings on this ph meter.
  • The LCD on this unit is very sharp.
  • Auto power off saves battery life with disable function
  • Waterproof housing extends its life.


  • You cannot store its results on an SD card.

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Extech pH Meters – Frequently Asked Questions

Is it difficult to recharge Extech ph meters?

No, all you have to do is to replace button cells to replenish the power of Extech ph meters.

Are there any side-effects of using pH meters on plants?

No, pH meters do not harm your plants in any way.

Can I fulfill all my gardening needs of checking pH with Extech pH meters?

Extech pH meters come with all the features any gardener needs, and you can use them to take any pH measurements related to gardening.

Do Extech ph meters come with any warranty?

Yes, Extech pH meters come with a warranty, and the customer support service of Extech is also good.

Is it possible to measure the pH of my hydroponic items using these ph meters?

Yes, you can measure the pH values of any of your hydroponic items with these pH meters.

Is it true that pH meters are not any better than litmus papers to measure pH?

pH meters are several times better than litmus papers to measure pH.

Is it difficult to calibrate the pH meters?

No, pH meters can be easily calibrated. With Extech pH meters, all you have to do is to press the CAL button to calibrate them.

Final Words

pH is a very important factor for both soil and plants. Slightest variations in its value can stress plants.

Both the pH of water and soil needs to be provided as per the plant needs. If water pH is too low or too high for a plant, it will only cause to degrade the health of a plant. It slows down the photosynthesis, hence slowing down the plant growth eventually.

pH between 6.0 and 7.0 is good for soil-based planting, while suitable ph ranges in hydroponics are between 5.5 and 6.5.

As it is evident that setting the proper ph is necessary for your plants, the best way to check it is by using a pH meter. Extech provides one of the best ph meters present in the market and we have reviewed them in this article. Make sure to pick one for your garden to have healthy plants. Happy gardening!