The straightforward design of this pH meter make it a good option for those new to pH meters, but its accuracy and reliability make it well equipped for lab use as well. Its three-point calibration gives it an accuracy of +/- 0.02 pH, which should suit the needs of most. This meter can also measure the temperature of substances.
Some customers found that it took several minutes to take a reading with this meter.
Stable readings at any temperature. Uses AAA batteries. Carrying case and detailed instructions included. Large LCD display for easy reading. Simple to calibrate and use.
Requires regular calibration in order to get an accurate reading. Expensive.
The automatic calibration and simple design make this a reliable pH meter for the home. It stands out for its quick read time and compact size. Despite the low price, this meter claims to measure with an accuracy of +/- 0.01 pH. Unlike many other inexpensive pH meters, this model has automatic temperature correction.
Some customers found this meter difficult to calibrate.
Simple operation. Plastic cap and carrying case for safe storage when not in use. Gives clear results within a few seconds. Calibration takes only a minute or two.
This meter may give you a slightly inaccurate reading if the temperature is very hot or cold.
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Whether you’re testing the acidity of the water in your home or your latest batch of home brew, a pH meter is a helpful tool to have on hand for measuring acidity. A pH meter measures the hydrogen-ion activity of a liquid or surface — in other words, its acidity or alkalinity — using an electrode.
The three common types of pH meters are pen-style meters, handheld meters, and benchtop meters, all of which serve the same purpose but vary in design and sometimes in capability. Pen-style pH meters are compact and convenient but often lack the accuracy of benchtop pH meters. While basic pH meters only measure the acidity of a substance, pricier models may measure qualities like the conductivity or temperature. Nearly all modern pH models have LCDs, but the size of the display and its readability can vary.
The first step to choosing a pH meter is considering what tasks you will use it for. The price of pH meters can vary from $10 to $400 or more, so knowing what you need is important. Our guide will break down the different types of pH meters and their capabilities and features.
A pH meter may be used for brewing beer or wine, making cheese, maintaining swimming pools, checking the acidity of tap water, and numerous scientific applications. Your needs should inform the type of pH meter you select, as some models are more accurate than others.
The design of a pH meter determines how it is used and how portable it is.
Pen-style pH meters are the least expensive and easiest to use. They are slim and small enough to fit in your pocket. The electrode in the tip is used to take measurements. These may be waterproof and can be used with one hand.
Handheld pH meters have a large display and an electrode at the end of an attached cable. This design requires two hands to use, though it is still a highly portable option. Many handheld pH meters are waterproof; some are also shockproof. The computer in a handheld meter is often more capable than that of a pen-style meter.
Benchtop pH meters are by far the most expensive options and are designed for lab work. They are often the most accurate and use a variety of electrodes specific to different types of work. Benchtop pH meters are easy to use and well-suited to a variety of tasks. Some have the ability to track your data as you work.
For measuring solids (like cheese) or soil, a pH meter designed specifically for the job is needed. Surface pH readers are commonly used for food, and soil pH readers are used for measuring the pH of soil.
Most pH meters have an accuracy of around +/- 0.01 to +/- 0.02. Higher accuracy is always better, but it often comes with a higher price tag. If you are working with cheese, beer, or wine, you will need an accuracy of at least +/- 0.01. Some benchtop models are as accurate as +/- 0.001.
The range of a pH meter should be appropriate for the substance you are measuring. Most meters can measure from pH 0 to +14, while meters with an extended range may be capable of measuring from pH -2 to +20.
The resolution is the amount of information that can be displayed on the screen of a meter. A pH meter with 0.1 resolution will display the pH in tenths.
The temperature of a substance affects its pH. As a result, temperature correction is often necessary for a pH meter to take consistent measurements. While many entry-level pH meters have no temperature correction, some have manual or automatic temperature correction. Automatic temperature correction is the easiest and most desirable option. Manual temperature correction requires you to input the current temperature of the substance you are measuring.
If you opt for a model without temperature correction, try to measure a particular substance at the same temperature each time for accurate results.
Measures temperature or pH
For a pH meter that can also measure temperature, this is a good choice. The three-point calibration makes this meter suited to lab work as well as hobbies like homebrewing.
The display of your pH meter should be large enough to read clearly while you work. Most displays simply show the pH measurement taken most recently, but some show additional data such as temperature, salinity, and conductivity.
There are two ways to calibrate a pH meter: manually and automatically.
Meters with manual calibration have two knobs you must maneuver to properly calibrate your meter. This takes some skill but may result in a more accurate measurement. Automatic calibration is performed by pressing a button on the meter. Some models offer you the choice of manual or automatic calibration.
Carefully follow the included instructions when calibrating your pH meter. In most cases, it involves placing the electrode in a buffer solution and pressing the automatic calibration button or turning the manual calibration knobs.
The calibration method for pH meters is either one-point, two-point, or three-point calibration. This refers to the number of buffers a pH meter uses to calibrate, with more points resulting in greater accuracy.
The electrode in a pH meter is filled with a solution that will dry out over time. This means the electrode must either be refilled or replaced.
The three common types of pH meters are pen-style, handheld, and benchtop meters.
A backlight can make the LCD of a pH meter easier to read in dark — and very bright — environments, ensuring that you don’t misread the screen. This feature can be found in many pen-style and handheld models.
Some pH meters are capable of gathering additional measurements from substances. In some cases, this is done simultaneously with pH readings. With most models, the meter must be switched to a different mode to take the reading.
Additional measurements may include the following.
A pH meter can be an essential tool for gardening, beer brewing, or maintaining your pool.
Entry-level pH meters for $5 to $50 are usually pen-style meters with sealed electrodes. These meters are typically limited to reading only pH and are usually calibrated automatically. Most soil pH meters fall in this range.
For $50 to $100, you will find pen-style and handheld pH meters suited to hobbies like beer brewing and wine making. These meters may be more robust, with a few waterproof and shockproof models available in this range.
High-end pH meters that cost $100 to $500 may be pen-style, handheld, or benchtop models. Meters in this range may be capable of measuring temperature, ORP, and other qualities of substances. Lab-ready meters are usually found for $300 to $400.
A pH meter measures the pH of a substance by measuring its voltage and comparing it with the voltage of buffer solutions.
Looking for a reliable soil pH meter? In addition to pH, the iPower Soil pH Meter also measures the moisture and light levels of soil. If you need a simple soil tester, this is a great tool at a low price.
If you are looking for a handheld pH meter, the Bluelab Combo Meter is a popular choice. Though it’s intended for use with hydroponic nutrient solutions, it works just as well for brewing and other hobbies. Customers love this reliable model for its accuracy and easy calibration.
If you need a benchtop pH meter, the Apera Instruments PH700 Benchtop Lab pH meter is a compact option that features simultaneous pH and temperature measurement. This is one of the more expensive pH meters available, but it works well for lab use or for accurate measurements at home.
Q. How do I clean the electrode probe of my pH meter?
A. The electrode should be wiped with a clean cloth and ionized water after every use.
Q. How often do I need to calibrate my pH meter?
A. A pH meter should be calibrated about once a week. However, this may vary from one model to the next. For best results, check the instructions provided by the manufacturer.
Q. When should pH tabs be used instead of a pH meter?
A. A pH meter is almost always more accurate than pH tabs and can be used over and over. If you only need to determine the pH of something a few times, pH tabs may suit your needs. But any serious brewer or cheesemaker will need a reliable pH meter.
Q. How do you store a pH meter?
A. In order to keep the electrode from drying out, most pH meters come with a storage solution that goes in the cap. This keeps the electrode moist.
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