In most places of NZ, the water from the tap is simply delicious, clean and quite perfect for homebrewing and testing is not generally required.
But not all water is the same.
Ever heard of a place called Flint, Michigan?
My vague recollections of 5th-form science are that there's hard water, soft water and everything in between.
And then there's the pH of water.
But is that what we care about when making beer?
Kind of.
It's really the pH of the mash / wort that brewers like to think about.
pH is the measurement of acidity or alkalinity of a solution, where the number of hydrogen ions is measured.
pH is the measurement of acidity or alkalinity of a solution, where the number of hydrogen ions is measured.
In the last 10 years or so, an increased understanding of the important role that the pH level of the mash plays in brewing really good beer has driven both commercial and backyard brewers to closely focus on monitoring and then adjusting their mash pH levels as required.
| Recommended | Reasons Why the Tool is Suitable for Testing pH of Wort |
|---|---|
| Milwaukee MW102 PH and Temperature Meter | Designed for professional use, this meter offers high accuracy with automatic temperature compensation, which is crucial for brewing beer as temperature can affect pH readings. It provides quick and reliable pH and temperature measurements, making it ideal for maintaining the correct pH level during brewing. |
| Oakton EcoTestr pH 2+ Pocket pH Meter | This meter is waterproof and durable, making it suitable for the brewery environment. It's easy to use with its large display and simple calibration process, which is great for quick pH checks during brewing. Its portability also allows brewers to use it at different stages of the brewing process effortlessly. |
| Hach Pocket Pro + Ph meter | Known for its accuracy and reliability, this meter features a user-friendly interface and is equipped with diagnostics for quality data results. It's specifically designed for field use, which means it can handle the rigors of a brewing setting while providing consistent pH readings. |
| Hanna Instruments HI 98128 | This pH tester is compact and waterproof, featuring automatic temperature compensation and a dual-level LCD that displays both pH and temperature. It's known for its fast response time and stability indicator, making it an excellent choice for brewers who need quick and accurate measurements. |
| Apera Instruments AI312 PH60F Premium pH Pocket Tester | This tester is designed for precision with features like a replaceable glass probe suitable for regular and complex testing environments, including brewery settings. It offers automatic calibration, waterproof body, and a digital display with simultaneous temperature reading, which are beneficial for detailed monitoring in beer brewing. |
What is a pH meter used for in brewing?
A pH meter is a calibrated scientific instrument that measures the hydrogen-ion activity in water-based solutions, indicating its acidity or alkalinity.The pH meter measures the difference in 'electrical potential' between a pH electrode and a reference electrode. This page has an excellent explanation of how ph Meters actually work and explains the science behind them really well.
pH meters may be utilized in many applications ranging from laboratory experimentation to quality control and checking that your batch of wine or kombucha is on the correct fermentation path but for the beer brewer, we are concentrating on the beer mash.
The modern food and beverage industries cannot exist without them!
In terms of the home environment, their many uses include soil, aquariums, hot pools, drinking water, swimming pools, home hydroponics, preparation of kombucha and the like.
The best meters are leak-proof, maintenance-free (other than the electrodes), are robust and sturdy in that they don't break easily, and they're not affected by dirt and electrode probe replacement must be straightforward!
They should also be affordable and in many instances work best if handheld.
In terms of the home environment, their many uses include soil, aquariums, hot pools, drinking water, swimming pools, home hydroponics, preparation of kombucha and the like.
The best meters are leak-proof, maintenance-free (other than the electrodes), are robust and sturdy in that they don't break easily, and they're not affected by dirt and electrode probe replacement must be straightforward!
They should also be affordable and in many instances work best if handheld.
Here's 5 of the best, mid range and mid price meters that you can find online:
Oakton EcoTestr pH 2+ Pocket pH Meter
This is a fairly popular pocket product from Oakton. The display is fairly large with a good viewing angle.It has indicators for battery life (1000 hours), readiness, and calibration (one touch), and shows both the parameter and temperature readings at the same time.
The cap was recently redesigned to be leak-proof and can be attached to the top of the meter when not being used— so no more lost caps for the homebrewers!
The cap features a fill line, so you know how much beer wort sample you need for an accurate reading when using the cap as a sample cup. It is also wider, providing a base to keep the meter upright for hands-free measurements.
The new housing is compatible with lanyards to prevent losing or dropping, but is still waterproof and floats just in case you drop it into your mash...
Takes four A76 1.5 V miniature alkaline batteries which can achieve a battery life of 100 hours. Why head to good old cheap Walmart when you can check the price on Amazon! Remember if you have Amazon Prime, you can get free shipping!
Milwaukee MW102 PH and Temperature Meter
<< This is our most popular seller! >>
The MW102 Standard Portable pH / Temperature Meter Standard is a standard yet affordable portable meter with no frills.
The Milwaukee brand is recognized as having a reputation for producing low-cost durable meters for quick and reliable measurements.
Milwaukee’s Standard manufacturer advertises that their digital meters are "manufactured to be easy to use, practical and accurate. Ideal for the classroom, laboratory or for general field use".
The MW102 is a microprocessor-based pH/Temperature meter with an extended range (-2.00 to 16.00 pH), Automatic Temperature Compensation, automatic calibration in 2 points and ±0.02 pH accuracy. The meter is supplied with pH electrodes and calibration solutions.
It's thus quite ideal for anyone working on a low budget but still requires fast and reliable measurements.
The full kit comes with:
| Item | Description |
|---|---|
| MW102 Unit | Main device for pH and temperature measurement. |
| 9v Battery | Power source for the unit. |
| Temperature Probe (MA830r) | Probe used for measuring temperature, essential for accurate pH readings. |
| pH Probe (MA911B/1) | Probe used for measuring the pH level. |
| pH Probe Cover | A small bottle that fits on the pH probe when not in use, holds storage solution. |
| User Manual & Registration Card | Instructions for use and product registration information. |
| 20 ml sachet of pH 4.01 Calibration Solution | Solution used to calibrate the pH probe at pH 4.01. |
| 20 ml sachet of pH 7.01 Calibration Solution | Solution used to calibrate the pH probe at pH 7.01. |
| 20 ml sachet of pH Storage Solution Packet | Solution used for storing the pH probe to maintain its accuracy and longevity. |
The battery life is estimated by at 300 hours and it features an auto-off after 8 minutes of inactivity.
"fantastic tool to have in my brewing arsenal. I originally bought it for taking readings while kettle souring, but it's been invaluable as I dove deeper into water profile and mash pH adjustment. It's a bit more expensive than some of the cheaper meters out there, but you get what you pay for. Worth every penny in my book, and I regularly recommend it to those in the market for a high-quality meter."
That's a quality recommendation.
Bluelab Combo Meter
It's the real deal analyzer.
The Bluelab Combo Meter is a portable pH, conductivity and temperature meter all in one.
The meter has two probes, a pH Probe and a conductivity/temperature probe. When taking a reading, simply place them into the solution and the selected reading is displayed on the screen.
The calibration of the pH probe is fairly simple as instructions are supplied on the back of the meter and the easy push-button method makes this one of the no-brainer meters to try.
The pH probe is replaceable so you can use this meter for years to come. You really should be able to do as Bluelab offer a 5-year warranty on their product which should give you an idea of the quality of the product and the faith the brand has in it.
Hach Pocket Pro + Plus 9532000 with replacement electrode
Manufacturer Hach reckons that their digital Pocket Pro + will help "take the guesswork out of your measurements" which is entirely the point of a pH meter so a good start that we are on the same page.
Hach Pocket Pro+ is engineered to deliver accurate results. Hach boasts the Pro is backed up with built-in performance diagnostics, you never have to guess when to clean or calibrate the sensor.
Featuring a large, easy-to-read LCD screen, the pH range covers 0 to 14 pH meaning it can be used for more than beer brewing, like hydroponics.
Hach Pocket Pro+ is engineered to deliver accurate results. Hach boasts the Pro is backed up with built-in performance diagnostics, you never have to guess when to clean or calibrate the sensor.
Featuring a large, easy-to-read LCD screen, the pH range covers 0 to 14 pH meaning it can be used for more than beer brewing, like hydroponics.
The unit takes 4 Triple AAA batteries which are easy to replace. Hach recommends that the electrodes are replaced every 6 months. This unit comes with a replacement unit.
Hanna Instruments HI98128 pHep 5pH / Temperature Tester
The Hanna Instruments HI 98128 is a popular compact pH tester used in the laboratory and for industrial applications.
The dual-line LCD screen simultaneously shows the current measurement and the current temperature, and a hold function freezes readings for recording.
The meter has automatic calibration at one or two points with two sets of standard buffers (pH 4.01/7.01/10.01 or pH 4.01/6.86/9.18).
The meter has water-resistant housing, a tactile grip casing, and floats.
The unit requires four 1.5V AA batteries which provide approximately 300 hours of continuous use. The Hanna meter switches off after eight minutes of inactivity to preserve battery life.
The meter also comes with an 'HI 73127 pH electrode', an electrode removal tool, and instructions on how to properly use and care for the unit.
Hanna Instrument Features | Description |
|---|---|
| Automatic Temperature Compensation | Adjusts the pH reading based on the temperature to ensure accuracy. |
| Automatic Calibration | Simplifies the process of calibrating the device for precise measurements. |
| Dual-line LCD Reader Screen | Displays multiple pieces of information simultaneously for convenience. |
| Replaceable Electrode Cartridge | Allows for easy replacement of the electrode, extending the device’s life. |
| PPM Readings | Provides parts per million measurements for detailed analysis. |
| Housing That Floats | Prevents loss by floating if dropped in water, enhancing durability in various environments. |
Check out the price on Amazon.
Apera Instruments AI312 PH60F Premium pH Pocket Tester
Apera is a well known and trusted brand and one we happily recommend.
It's a step up from the cheapest units out there and is a popular selling mid-price model. Diligent maintenance of the electrode will see this unit last the distance.
This handy unit boasts the following features:
- Easy-to-install Replaceable flat sensor
- Triple-Junction structure prevents clogging, works great for regular pH measurement
- Easy Auto Calibration with auto buffer recognition
- Auto Temperature Compensation
- Unique High/ Low-Value HEADS-UP function, instantly reminding you of any results that need your attention with a red backlight;
- Auto recognition of stable values (with optional AUTO HOLD function)
- Large, clear Liquid Crystal Display with 3 backlit color (indicating 3 different modes)
- Display both temp and pH simultaneously
- Also comes with calibration buffer solutions, calibration bottles, storage solutions, AAA batteries, and a lanyard all in a portable carrying case!
But why do brewers care about mash pH?
First of all, beers brewed within a general range of ph tend to brew better than beers that are too acidic or too low in pH.
So, brewers like to take the ph of their mash to determine if it is in the optimal range for the beer they are trying to make.
The optimal range is generally considered to be pH 5.2 to 5.4. A high reading means the beer is too alkaline.
If a brewer's meter determines the pH is too high, they will then need to adjust the level downward by adding acid or calcium sulfate.
Hopbrewer shares their advice: “The conventional wisdom is that a mash pH of 5.0-5.2 is pushing a crisper beer — you’d aim for that with a pilsner or IPA or pale ale. Once you get to a pH of 5.3-5.6, you might get more roundness and less of that tart character. But you also run the risk of extracting tannins.”
So how do I use a Ph Meter to test my beer mash?
pH meters are basically glorified voltmeters that measure the 'electrical potential' produced by a special pH probe.Using a pH meter is a fairly simple process.
One should generally draw a small sample of the wort and put it in a clean holding vessel such as a shot glass. Dip the probes fully into it to get a pH reading.
Make sure your device is turned on and that you have calibrated the meter first!
And remember, the mash can be hot, so be careful not to burn yourself.
THAT said, pH levels should be measured at near room temperature to get an accurate result (that's just good science). So if you could cool your sample quickly (a short time in the fridge), maybe give a stir, you'll get a genuine reading.
Don't cool it too much as you'll go below room temperature. I've read that one dude keeps shot glasses ready in the freezer to help with cooling!
Eh, that's a bit of mucking around, maybe do not worry too much...
THAT said, many of the best pH meters will have Automatic Temperature Calibration features and speaking of features...
To make a calibration curve at least three standards are needed. Without the standardized pH buffer to calibrate the meter, the results will not be accurate and thus give you the wrong impression.
PH meters can 'drift' from their calibrated settings. It is important to calibrate your pH meter often so that the accuracy of results is maintained.
And remember, the mash can be hot, so be careful not to burn yourself.
THAT said, pH levels should be measured at near room temperature to get an accurate result (that's just good science). So if you could cool your sample quickly (a short time in the fridge), maybe give a stir, you'll get a genuine reading.
Don't cool it too much as you'll go below room temperature. I've read that one dude keeps shot glasses ready in the freezer to help with cooling!
Eh, that's a bit of mucking around, maybe do not worry too much...
THAT said, many of the best pH meters will have Automatic Temperature Calibration features and speaking of features...
Why do I have to calibrate my ph Meter?
You need an accurate reading so you can make the best decision for your beer!
To make a calibration curve at least three standards are needed. Without the standardized pH buffer to calibrate the meter, the results will not be accurate and thus give you the wrong impression.
PH meters can 'drift' from their calibrated settings. It is important to calibrate your pH meter often so that the accuracy of results is maintained.
What are the specifications of a good ph Meter?
The best ph Meters can have the following specifications or qualities:
| Specification/Quality | Description |
|---|---|
| Replaceable Electrode | Allows for the electrode to be replaced instead of purchasing a new meter. |
| 2-3 Point Automatic Calibration | Provides easy and reliable calibration for accurate readings. |
| Accuracy | High accuracy level, up to ±0.01 pH, ensures precise measurements. |
| Portability | Most home brewers prefer portable models for convenience. |
| Price Range | Typically between $100 - $150, indicating a reliable quality level. |
| Automatic Temperature Compensation (ATC) | Compensates for temperature variations to provide accurate readings. |
| Durability | Built to last, suitable for long-term use. |
What is Automatic Temperature Compensation?
As mentioned elsewhere in this post the mash's pH measurement is ideally conducted at room temperature. This helps avoid measurement errors that can be caused by temperature effects on the probe and chemically in the mash.
So ATC accounts for differing temperatures of the mash.
Probes can wear out so require proper storage
Probes wear out over time and you should expect that you’ll have to replace quality ones every 2-3 years if you take good care of them and how much use they get.
The probes should be stored in a pH storage solution to preserve their lifespan. Open, dry air ruins their potential. So when buying your pH meter you need to purchase a pH buffer or 'calibration kit'.
This is why units like the Milwaukee MW102 and Omega PHH-7011 come with solutions but replacement calibration kits can be separately brought online. You might see them called 'reference solutions'.
The Bluelab Combo Meter is very popular with horticulturalists and hydroponics enthusiasts (yes, even marijuana growers...)
Keeping the probe clean after each use will prolong their life - it's a good idea to clean the outside with a soft toothbrush and deionized water, being very gentle with the bulb part of the probe if this is the kind you have.
It's extremely important to never let the probe dry out and this is a common mistake when storing ph meters. To this end, it is imperative that you store the electrode as per the manufacturers' instructions.
The normal way to store the probe electrode is in the recommended storage solution which is normally a concentrated form of potassium chloride.
The probes should be stored in a pH storage solution to preserve their lifespan. Open, dry air ruins their potential. So when buying your pH meter you need to purchase a pH buffer or 'calibration kit'.
This is why units like the Milwaukee MW102 and Omega PHH-7011 come with solutions but replacement calibration kits can be separately brought online. You might see them called 'reference solutions'.
The Bluelab Combo Meter is very popular with horticulturalists and hydroponics enthusiasts (yes, even marijuana growers...)
Keeping the probe clean after each use will prolong their life - it's a good idea to clean the outside with a soft toothbrush and deionized water, being very gentle with the bulb part of the probe if this is the kind you have.
It's extremely important to never let the probe dry out and this is a common mistake when storing ph meters. To this end, it is imperative that you store the electrode as per the manufacturers' instructions.
The normal way to store the probe electrode is in the recommended storage solution which is normally a concentrated form of potassium chloride.
Be wary of buying cheap pH meters
I see the phrase "where can I buy a cheap pH meter for brewing?" all the time. While I understand money talks, I don't think cheapness should really be a motivation when buying a meter or indeed most brewing equipment for that matterThe cheaper the unit, the more likely you will get less than accurate readings and the units electrodes themselves will not last long if used frequently.
Many brewer has found that by investing in a better quality unit, they get the best results.
To that end, we generally recommend a price point of 100 to 150 dollars. That said you can go 'cray cray' on price so if going high value, make sure you will get the benefit.
More serious brewers tend to go for benchtop units rather than the portable kind.
You could liken it to how beginner brewers start out. The first thing they buy is a brew kettle or pot and they usually get the cheaper, smaller size kettle – and then suddenly they find they want to keep going with beer making and so need to purchase the bigger kettle or brewing pot.
More serious brewers tend to go for benchtop units rather than the portable kind.
You could liken it to how beginner brewers start out. The first thing they buy is a brew kettle or pot and they usually get the cheaper, smaller size kettle – and then suddenly they find they want to keep going with beer making and so need to purchase the bigger kettle or brewing pot.
It's the same with the pH meter - get the better one to save you from having to buy another later on.
Finally, a word on pH strips
Did you ever get to use litmus paper in school science to determine if a solution was an acid or a base?
The red paper turned blue or something.
While litmus paper is a yes or no test if a solution is acidic or alkaline, the pH strip gives you an approximate measurement of the actual pH.
Thus, you can use ph strips to test your beer if you wish but those will only give an indication as to your water or brew's pH level, and will never be as accurate as a quality meter.
You can use gypsum to increase bitterness and reduce pH levels. The red paper turned blue or something.
While litmus paper is a yes or no test if a solution is acidic or alkaline, the pH strip gives you an approximate measurement of the actual pH.
Thus, you can use ph strips to test your beer if you wish but those will only give an indication as to your water or brew's pH level, and will never be as accurate as a quality meter.
GREAT... Thanks for the comparison. Just looking at reviews of each I think I'll go with the Apera Instruments AI1201 PH60-E Replacement Probe for PH60 Pocket pH Tester. Mainly because it's reasonably priced and has not just stopped working for anyone as much. And it has a replaceable probe.
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