Best Digital PH Meters

Best Digital PH Meters

There are a range of reasons you may be looking for a pH meter. pH meters allow s to measure the acidity of a liquid. They can come in very handy for hydroponics, brewing coffee, testing drinking water, maintaining the ideal pH in a swimming pool, as well as many other uses. Finding a digital pH meter means you'll be able to more easily view the readings and can have more confidence in their accuracy.

If you're looking for the best digital pH meter, you've come to the right place. We've put together reviews of some of the top choices on the market. Take a few minutes to read through our reviews and decide which digital pH meter is right for you.

Top 7: Best Digital PH Meters

Best Hygrometers

Best Hygrometers

Bluelab MONGUA Guardian Monitor for pH, Temperature, and Conductivity Measures

If you're looking for the best of the best when it comes to pH meters, take a look at the Bluelab MONGUA Guardian Monitor. This is a mountable meter that can measure so much more than just pH. It can also measure temperature, ppm 500, ppm 700, tds, EC, and CF. Some of the many applications for the meter include hydroponics, pools, drinking water, and brewing.

The digital meter offers two-point calibration with an automatic temperature compensation for accuracy and ease of use. It can be used for 24/7 monitoring of nutrients and pH levels to help plants thrive.

The meter features a large and easy to read LCD display. The display is backlit for easy reading in all lighting conditions.

Calibration solution is included with each purchase. The manufacturer also offers a two-year limited warranty to protect your purchase.


  • In addition to measuring pH, it can also measure temperature, tds, ED, CF, ppm 500 and ppm 700.
  • It automatically compensates for temperature when measuring pH.
  • The LCD display is backlit and easy to read.


  • This unit is significantly more expensive than many other pH meters.

Apera Instruments SX620 pH Pen Tester Kit

The pH Pen Tester Kit from Apera Instruments is another top option to consider. This is a compact kit that offers an easy-to-use pH pen-style meter. It can be used to check the pH of liquids for aquaculture, hydroponics, pools, making beverages, and much more.

The pen offers an accuracy within +/- .01, making it a very reliable choice. It is also easy to calibrate with automatic 3-point calibration.

Another advantage of this pH pen is that is automatically compensates for temperatures between 0 and 60 degrees Celsius (140 degrees Fahrenheit). You can switch the display between Fahrenheit and Celsius based on your preferences and the substance you are monitoring.

The probe on this meter is slim enough to easily fit into test tubes for lab work. It is also replaceable to help you get the most out of your purchase.

Some of the other features of this meter include the automatic power-off after inactivity and the pH probe invalidation reminder (to alert you when the probe should be replaced for optimal accuracy). The kit also includes calibration solutions with pHs of 4, 7, and 10 and a 3M KCl storage solution. Everything is paced in a portable case for safe-keeping and easy transport.


  • This pH meter is accurate withing +/- .01.
  • It automatically compensates for temperature for accurate readings.
  • The kit comes in a case to keep the pH meter and everything else organized.


  • Some users noted that they didn't find the readings to be very consistent.
Soil Moisture Meters

Soil Moisture Meters

Dr.meter pH Tester Pen

The Dr.meter pH Tester Pen is designed to be accurate and easy to use. It offers simple 3-point automatic calibration to reduce the time and effort you need to put into keeping it calibrated.

This model also offers automatic temperature compensation. To prevent false readings due to temperature differences, it automatically adjusts the reading based on the temperature.

The pH tester pen offers an easy-to-read digital display. The screen is larger than many other small pH probes to prevent users from needing to squint while reading it. The screen is also backlit to ensure you'll be able to read it clearly regardless of how much light is available.

To help users make sure their pH is in the desired range, this model also features an alert if the pH is too high or low. The display will become red and flash is a pH reading is below 3.5 or above 12.5.

This model just requires two AAA batteries to work. Each purchase includes a storage case and calibration solution.


  • This model has a large, backlit display that is easy to ready.
  • It will compensate for temperature to offer accurate readings.
  • If the pH is too high or too low, the screen will turn red and flash.


  • Some users shared that they questioned the accuracy of the readings they got with this pH meter.

APLUSATE Digital PH Meter

If accuracy is important to you, this APLUSATE Digital pH meter is designed to be highly accurate. It features a sensitive electrode sensor that will deliver precise pH readings of liquids for hydroponics, swimming pools, drinking water, brewing, and other purposes.

You'll also find that calibrating this model is easy. It can be calibrated using buffer powder and simply pressing one button on the meter. Additionally, this pH meter compensates for temperature and water quality to ensure the pH reading delivered is a true reflection of the liquid. It will deliver accurate readings between 32 degrees Fahrenheit and 176 degrees Fahrenheit.

Each purchase includes two built-in LR44 button cell batteries and three pH buffer powders.


  • The pH meter is simple to calibrate.
  • 3 buffer powders for calibration are included with each purchase.
  • It compensates for temperatures between 32- and 176-degrees Fahrenheit.


  • This digital display is not backlit.
Best Soil Test Kits

Best Soil Test Kits

Apera Instruments AI311 Premium Series PH60 pH Pocket Tester Kit

Next, you should take a close look at the Apera Instruments Premium Series pH Pocket Tester Kit. This model delivers accurate readings within +/- 0.01 with a pH range of -2.00 to 16.00. It also adjusts to temperatures between 32 degrees Fahrenheit and 122 degrees Fahrenheit for optimal accuracy when checking the pH of any liquid.

Calibration is a breeze with the autocalibration. It is set to automatically recognize five different types of solutions with a pH of 1.68, 4.00, 7.00, 10.01, and 12.46.

Compared to other models that may cost less, this is a top-quality product. It is designed with a replaceable pH probe made of glass.

The meter has a backlit LCD display for easy reading. There are three different colors that will show different modes that are being used. Additionally, when the reading is locked in and stable, a smiley icon will display to let you know the reading is finalized and ready to be recorded.

This pH probe is part of a kit. Each kit includes calibration solution, calibration bottles, AAA batteries, a lanyard, and a hard protective case.


  • This model is accurate within +/- 0.01.
  • The calibration mode is designed to automatically recognize five different solutions.
  • The smiley icon lets you know when a reading is stable and ready to be recorded.


  • It is more expensive than many other pen-style pH meters.

Bluelab PENPH pH Pen

Individuals looking for a lab-quality tool may want to consider the Bluelab PENPH pH Pen. This is a pocket-sized tool that is easy to use to test the pH of different liquids for a variety of uses includes brewing, hydroponics, swimming, drinking water, and more.

The pH meter features a double junction probe. Compared to the probes on some other models, this probe is designed to offer greater accuracy and an extended lifespan.

The pen pH meter offers two-point calibration to reduce the time you spend calibrating it while also ensure each reading is accurate. It has a backlit LCD display that makes it easy to read in a variety of lighting conditions.

This pen-style pH meter has an auto-off function to preserve the battery when it is not in use. There is also a low battery indicator light to alert users that it is time to replace the AAA battery.

Each kit comes with calibration solutions, a lanyard, and a AAA battery.


  • The double junction probe offers optimal accuracy.
  • With the backlit LCD display you can easily see the pH readings.
  • Calibration solutions are included with your purchase.


  • The tip is too wide to get into narrow spaces, such as a test tube.
Hose Timers

Hose Timers

Oakton AO-35423-01 EcoTestr pH Meter

As a final choice, consider the Oakton EcoTestr pH meter. This is a pocket-sized meter that is designed to be convenient and easy to use.

The meter offers a large digital display for easy readings. The viewing angle has been improved to make it simple to read the meter from different angles without needing to move or readjust. There are indicators for calibration, readiness for use, and battery level.

There is a fill line on the cap to help users add the ideal amount of a solution for taking a pH reading. Recent improvements in the product redesigned the cap so it is now leakproof and can stay attached to the meter when it is not in use. The base of the cap is also flat and wide to allow users to use it as a sample cup. It will allow the meter to remain upright without being held.

This model also offers one-touch calibration. In the event the pH meter is dropped into a solution, it will float for easy retrieval. However, it is also designed with a lanyard to provide extra security and prevent it from being accidentally dropped.


  • The display is large and easy to read.
  • The cap will double as a sample cup for taking readings.
  • You can easily calibrate the meter with just pressing one button.


  • This model doesn't offer the quality and accuracy of some of our other picks.

Buying Guide

Since there are a number of different options on the market when you're looking for a digital pH meter, it is important to take your time and evaluate your choices. Doing so will ensure the product you purchase is one that will meet your needs. Keep the features shared below in mind as you shop.


Before starting your search, you should first decide which style pH meter you would prefer. There are three main styles to choose from.

The first is a pen-style pH meter. These models are easy to operate using just one hand. They are designed to be more portable as well and typically come with a travel case.

The second type of pH meter is a handheld meter. These models will require users to use both of their hands when taking a pH reading. They are not as compact as a pen-style meter, but can still be transported without too much trouble.

An advantage of a handheld meter over a pen-style meter is that they have larger screens that are easier to read. Some also offer additional functions not present in pen-style models.

A benchtop pH meter is the third main style. These are the most accurate, but they're also the most expensive. Benchtop pH meters are also designed for use in a lab, not in a home or work environment.


When looking for a pH meter, finding one that is accurate is very important. Some models may offer accuracy up to +/-0.001, but most models are accurate between +/-0.01 and 0.2

Also take note of the range the pH meter will measure. Standard meters measure pH in the range of 0 to 14, but there are some meters on the market that will measure between -2 and 20.

Temperature Correction

If you're familiar with testing for pH, you likely know that a pH reading can be affected by the liquid's temperature. Some pH meters are designed to take the temperature into account and correct the pH display for greater accuracy.


All pH meters will need to be calibrated, but some are easier to calibrate than others. Choosing a meter that requires manual calibration will require more work, and it may take you a while to master the required technique. pH meters that offer automatic calibration, on the other hand, will be much easier to calibrate.


Some pH meters are more versatile than others and can take other readings for you. For example, some units may also measure the temperature, TC, ED, ppm, or CF of liquids. If you also need to monitor any of these levels, it may be important to you to choose a more versatile pH meter that will help you keep track of them.


Overtime, the solution in a pH meter's electrodes will dry out. When this happens, the electrode will need to be replaced.

Some pH meters are sold with sealed electrodes, while other models come with refillable electrodes. Models with sealed electrodes will not be usable once the solution dries out, while models with refillable electrodes can be used again when the solution is refilled. While pH meters with sealed electrodes cost less up front, they'll likely end up costing you more money overall since you'll need to purchase a new model once the solution dries up.

LCD Screen Display

One of the big advantages of a digital pH meter is that they offer an LCD display. However, take care to choose a digital pH meter with a screen that is easy to read. Look for models that are backlit and display large and clear readings.


Finally, compare the prices of the different digital pH meters you're considering. Use this information, along with the features offered by each meter, to help you select the best pH meter for your needs.

Our Favourite

Time to share our top pick for the best digital pH meter! After carefully comparing all the products we reviewed above, we selected the Bluelab MONGUA Guardian Monitor as our top pick.

Bluelab MONGUA Guardian Monitor for pH, Temperature, and Conductivity Measures

We like the versatility offered by this model. In addition to measuring pH, you can also use it to measure temperature, tds, ppm 500, ppm 700, EC, and CF. The meter automatically adjusts for temperature to provide more accurate pH readings.

Calibrating this unit is easy using the two-point calibration. Each purchase also includes a calibration solution.

This meter also offers a clear and easy to read backlit LCD display. We think you'll find the Bluelab MONGUA Guardian Monitor a perfect fit for your needs. However, if one of the other pH meters we reviewed seems like a better fit for you, don't hesitate to purchase it. We only selected top-quality products, so you really can't go wrong with any of our recommendations!

Frequently Asked Questions

What is a digital pH meter?

Digital pH meters are designed to measure the pH of a liquid. They can tell users the acidity or alkalinity of the liquid. pH meters are designed with a probe that is placed into the liquid to be tested. The probe connects to a meter that displays the pH reading.

Do you need to calibrate a digital pH meter?

Yes, digital pH meters will require calibration. This will help ensure they're able to provide accurate readings.

Is a pH meter more accurate than pH test strips?

Yes, when properly calibrated, a pH meter will yield more accurate readings that pH test strips. The meter on a pH meter is more sensitive than test strips which is why they're more accurate.

It is also easier to read a digital pH meter than it is to read test strips. The pH meter will display the reading, whereas you'll need to interpret and compare the color of the test strip. Some pH meters can measure pH to the .01th of a unit. This is simply not possible with test strips.

What is the best way to store a pH electrode?

If you have a pH meter, you'll want to take care to properly store the probes when they're not in sure. Improper storage can ruin the probes or decrease their useful lifespan.

When storing a pH probe, it is important to keep it moist. Using a potassium chloride solution is ideal. Potassium chloride solutions may also be called electrode storage solutions or pH storage solutions.

Do no store a pH meter in distilled is deionized water. Since there are hardly any ions in this water, it could lead the ions in the glass bulb to leach out, which will ruin the electrode.

Is distilled water bad for pH meters?

pH meters should never be stored in distilled water. Doing so can cause the ions to leach out of the glass bulb. This will ruin the probe on the pH meter.

However, distilled water is fine to use to rinse a pH meter before placing it in its storage solution.

How long does a pH meter last?

The length of time a pH meter will last can vary. Most pH probes will deteriorate within 12 to 18 months and will need to be replaced.