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In summer, there is nothing better than enjoying the sun undisturbed in your own garden. A private garden pool offers the perfect opportunity to cool off in clean and clear water.

However, if the water is contaminated, the most expensive pool is of no use. Therefore, you should always make sure that you clean the pool at regular intervals and add appropriate water care products, such as chlorine or algaecide, to the pool.

However, this should not be done by eye, so it is important to test the water regularly. During the pool season, this should be done at least once a week.

On the one hand, test strips can be held in the water for a short time, which then change color. Although this is child’s play, the values must then be interpreted by eye using a color scale. This is not always easy and unambiguous, which is why the measurement result is too inaccurate.

So it is not surprising that electronic test devices are becoming increasingly popular. Since the measurement accuracy is very high, the values are easy to read and the devices are now also much cheaper, compared to previous years, electronic water testers are the ideal and modern alternative for testing the most important water values.

When testing the water values, at least 2 parameters must be determined: The pH value, as well as the content of disinfectants, such as chlorine. In addition, there are other measurable values, such as water hardness, alkalinity, and last but not least, chlorine alternatives, such as active oxygen and bromine, which can be measured exclusively with an electronic pool water tester.

  • In test reports, electronic pool water testers are considered a cost-effective, durable and easy-to-use alternative for taking numerous values from the pool water.
  • In addition to the well-known and most important water values, such as the pH value and the chlorine content, electronic pool water testers are also able to determine other values. They also determine measurable values such as bromine and active oxygen content of the water, water hardness and alkalinity.
  • Unlike test strips, electronic water testers do not require any interpretation. All required values are clearly shown on a digital display within a very short time.

The best digital electronic water testers for the pool

AngebotBestseller No. 1
AquaChek TruTest Digital Test Strip Reader For Pool and Spa Water Testing - Tests for Free Chlorine,...
  • BENEFITS: TruTest provides digital results with the...
  • AQUACHEK ACCURACY: Using medical industry technology,...
  • FEATURES: Combines the ease & accuracy of AquaChek test...
  • EASY TO USE: No interpreting colors; Just dip the test...
AngebotBestseller No. 2
LaMotte 2056 ColorQ Pro 7 Digital Pool Water Test Kit
  • Features a photometer which gives you a digital reading...
  • Water resistant housing and carrying case provided.
  • Tests Free Chlorine, Total Chlorine, Bromine, PH,...
  • Uses liquid reagents for all test factors except...
Bestseller No. 3
ITS 486201 Pool Exact EZ Photometer Entry Digital Pool Water Test Kit - 6-Tests Each
  • EASY TO USE: Incorporates the patented eXact Strip...
  • DETECTION RANGES OF TESTS: Total Alkalinity: 10 - 200...
  • ENTRY KIT: Clamshell includes Pool eXact EZ Photometer,...
  • ACCURATE AND RELIABLE: Components are tested by Quality...
Bestseller No. 4
Hot Tub and Pool Test Set 13 in 1 - Professional Pool and Spa Water Testing for Home Easy to Use...
  • SPECIAL EDITION: Our water tester comes in a modern and...
  • MULTI-FUNCTIONAL: With our 13 in 1 water tester, you...
  • FREE SOFTWARE: Our electronic water tester comes with...
  • POWER EFFICIENT: The electronic photometer doesn’t...

Guide: Buying the right digital water tester

Electronic water testers are digital alternatives to analog determination methods, such as test strips. For the electronic measurement of the water values such as chlorine, pH value, alkalinity as well as further, the most different options offer themselves.

It is possible to choose whether only one parameter is to be measured or whether several parameters are to be covered at once with a device in a higher price category. Thus, electronic water testers greatly facilitate a weekly control of the water values of each pool owner. In addition, the reading of the parameters is also significantly simplified.

The correct use of an electronic water tester

With some devices, calibration must first be performed, which can be easily initiated by pressing a button. Everything else is then done automatically by the device.

If the device has visible contacts, you need to do nothing more than hold them in the pool water, wait for the measurement and then read the result. So-called photometers have reagents that are filled with pool water.

A tablet is then placed in these reagents and the measuring device takes over the measurement with the help of a built-in light sensor technology. Finally, it is possible to read the result on the display and dose accordingly.

An electronic water tester should be recalibrated at regular intervals. To do this, simply immerse the device in an available reference liquid and then, in the case of manual devices, adjust it by turning a small screw.

However, the small disadvantage of manual calibration is usually compensated by a lower price. Electrodes and batteries are usually replaceable and can be ordered separately in most cases.

Test strips VS digital electronic water testers

Test strips allow a particularly fast measurement. Here, the test strip on which there are small cushions is simply held briefly in the water of the pool. After a few seconds, the cushions change color and can be compared with the fields on the packaging by color matching.

The biggest advantages of electronic water testers are the extremely high measuring accuracy, the possibility to determine many different parameters and the clear output of the respective value on an LCD display.

This eliminates the need to compare the test solution with a color scale, which is sometimes ambiguous and leaves room for interpretation. Otherwise, the procedure is similar to that of a simple test strip.

Test strips are extremely easy to use and are ideal for a quick measurement in between. However, test strips do not come close to the measuring accuracy of an electronic water tester with tablets or an automatic measuring device. A combination of both methods is therefore recommended.

The fixed weekly measurement is carried out with the manual pool test container, in order to add the required amount of care products to the water on the basis of this. In between or for follow-up control, the test strips can be used.

If the water analysis is to be carried out even more professionally, or if other values besides pH and chlorine or bromine or active oxygen are to be tested, an electronic water tester is the right choice.

The most important water parameters

  • pH value: For a pool, the ideal pH value is 7.2, but values between 7.0 and 7.4 are also acceptable. The value is often elevated due to the addition of chlorine. However, if a lot of acidic rainwater enters the pool, the value can also decrease.
  • Alkalinity: The pH value of the water can be protected against fluctuations thanks to alkalinity, also called TA value. Ideally, this is between 80 – 160mb/l. If the value is lower, the pH can fluctuate greatly. If the TA value is higher, this makes it more difficult to change the pH.
  • Chlorine: When chorine tablets or chlorine granules are added to the water, free chlorine is formed. This chlorine subsequently binds urea, for example. This is how combined chlorine is formed. The free and combined chlorine together determine the total chlorine value.
    It is advisable to set the free chlorine content of the pool water between 0.3 and 0.6 mg/l. The combined chlorine, on the other hand, should not exceed this value. The combined chlorine, on the other hand, should not be higher than 0.5mg/l. In addition, it should be noted that the chlorine content is influenced by water quality, UV radiation, filter system and the number of bathers.
  • Cyanuric acid: To ensure that the chlorine in the pool water does not degrade immediately, it is important to add cyanuric acid as a stabilizer. Thanks to cyanuric acid, it is easier to chlorinate the water evenly. The optimal cyanuric acid value is between 30 and 50 mg/l.

FAQ: Frequently asked questions about electronic water testers answered

Which water parameters can be measured with an electronic water tester?

With electronic water testers, it is usually possible to measure all common water parameters. This includes pH, chlorine, alkalinity, bromine, cyanuric acid, active oxygen, chlorine dioxide, ozone and hydrogen peroxide. However, the scope is highly dependent on the particular instrument.
In most cases, the devices are able to measure the pH and chlorine content, which are also the most important values for clear water in the pool.

Can I use an electronic water tester for other water sources as well?

Of course, an electronic water tester can also be used for other liquids away from your own pool. Depending on your needs, using it in aquariums, spas, hot tubs, for tap water or your own ponds is no problem at all.

Are there any ongoing costs in using an electronic water tester?

Basically, electronic water testers, regardless of the model, cannot do without test tablets or buffer powder. These are used to either perform the test itself or to recalibrate the device at regular intervals.
If the first quantity of these are still available in the scope of delivery, it is relatively quickly necessary to purchase these substances in order to be sure of the measurement results or to be able to use the device at all.


An electronic water tester is a reliable measuring device for the correct adherence to any dosage amounts for your own pool. This can ensure that subsequently neither too many chemicals are used, nor too little.

This makes it possible in both directions to keep the pool water permanently and reliably clear and clean, and also to protect one’s own body and that of one’s children from disproportionate amounts of cleaning chemicals.

Unlike analog measuring methods, electronic water testers are equipped with an LCD display that shows the exact value to a second decimal place. This eliminates any interpretation and a result can be read within seconds.

Larry has been a true water rat since childhood. Pure pleasure turned into a passion. That's why he is the first point of contact for friends and acquaintances when it comes to pool-related problems. He is an integral part of the PoolHandbook editorial team.