About Us

Prüfengel offers authentic consumer tests in which real users share their experiences with products. Our tests are based on practical applications in everyday life and reflect the opinions of consumers. As we focus on consumer tests, we do not carry out any material, long-term or laboratory tests. The tests are carried out by 1-2 independent consumers over a period of 7-14 days. The exact test conditions can be viewed in the test plan of the respective test report – click here to go directly to the test plan.

Manufacturers provide the tested products free of charge. We charge a one-off test fee for carrying out the tests. In addition, manufacturers pay an annual licence fee for the use of the Prüfengel seal. We also receive a commission for linking to manufacturers’ websites. These remunerations have no influence on our test results or ratings.

We guarantee transparency and a fair evaluation. For a detailed insight into our comprehensive evaluation process, please click here.

aquaself
Water hardness test strips

Manufacturer information:

The aquaself test strips for determining water hardness are a practical and reliable tool. They enable a quick and uncomplicated analysis that is suitable for both private and professional use. After a short waiting time, the water hardness can be read off using the colour scale on the packaging. The process does not require any specific knowledge or additional equipment and generates precise results within a few seconds. The test strips are ideal for testing drinking water, aquarium water and water from other sources. They support the control of water quality and enable measures to be taken to improve water hardness where necessary. Regular monitoring of water hardness also ensures that appliances such as washing machines and dishwashers function optimally and protects them from limescale. The resealable packaging of the test strips protects them from moisture and other environmental influences and ensures a long shelf life and reliability of the test strips.

  • Easy handling
  • Fast results
  • Good instructions
  • An addendum explaining the health effects of different degrees of hardness is missing

The first impression

Packaging and contents

Here we take a closer look at packaging. Sustainability is becoming an increasingly important factor. In addition, adequate protection of the product must of course also be guaranteed. Are the contents of the packaging complete and does the manufacturer make it as easy as possible for me to use the product straight away?

Here we take a closer look at packaging. Sustainability is becoming an increasingly important factor. In addition, adequate protection of the product must of course also be guaranteed. Are the contents of the packaging complete and does the manufacturer make it as easy as possible for me to use the product straight away?

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Product protection

Carton is sturdy, product sufficiently protected

100

Points

Sustainability Packaging

Unnecessary packaging waste has been avoided, the plastic film protects the product components

100

Points

Package contents & scope

Complete

100

Points

Instructions for use

Product is self-explanatory

100

Points

TOTAL

100

Points

Weighting: 20%
*Themaximum score is 100 points

Analysing the water hardness test strips from aquaself gives a positive first impression, which indicates the high quality of the product. Even the packaging gives a high-quality and carefully thought-out impression. The packaging is robust and resealable, which protects the test strips from moisture and other external influences and thus extends their shelf life. The design of the packaging can be described as modern and clear. It allows the user to see all the important information at a glance.
When the packaging is opened, the neatly packaged test strips catch the eye. The test strips are precisely cut and free from visible defects. Detailed instructions explaining the test procedure step by step are included. They are easy to follow, even for inexperienced users.
To summarise, both the packaging and the contents of the water hardness test strips from aquaself make an extremely positive first impression. The product gives the user a feeling of confidence in the reliability and accuracy of the test results.

The first time in your hand

Product processing and appearance

Before we start the practical test, we take a close look at the workmanship of the products. How high quality are the materials used? Are the look and feel satisfactory?

Before we start the practical test, we take a close look at the workmanship of the products. How high quality are the materials used? Are the look and feel satisfactory?

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Visual appearance

Attractive design

100

Points

Processing

Very good workmanship

100

Points

Stability

Very stable

100

Points

Sustainability of the product

No details, but use of high-quality materials

80

Points

TOTAL

95

Points

Weighting: 20%
*Themaximum score is 100 points

The quality of the water hardness test strips from aquaself is evident. The workmanship is of high quality and the design is well thought out. The test strips are precisely cut and made of robust material, which enables reliable and accurate measurement of water hardness. The appearance of the test strips and their packaging is modern and functional.
The packaging is not only visually appealing, but also practical, as it is resealable and protects the test strips from moisture and external influences. The colour scale on the packaging is clear and easy to read, making it quick and easy to evaluate the test results. The enclosed instructions are also clear and easy to understand, making it easier to use the test strips.
The product finish and appearance of the aquaself water hardness test strips are extremely positive. The high quality and well thought-out design contribute to the product being reliable and user-friendly.

This is what our practical test showed

Does the manufacturer keep its advertising promises?

Our practical test has the highest relevance and therefore weighting. Here, the product has to undergo a wide range of criteria and tests. We check the functions and product promises of the test article.

Our practical test has the highest relevance and therefore weighting. Here, the product has to undergo a wide range of criteria and tests. We check the functions and product promises of the test article.

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Accuracy of the water hardness display

A very high correspondence between the stripes and the colour scale

100

Points

Reproducibility of the results

Test results of all samples absolutely identical

100

Points

Handling the test strips

Test strips can be removed and used without any difficulty

100

Points

Comprehensibility of the colour scale

Colour scale is immediately understandable, additional information on health effects would be desirable

90

Points

Easy storage of the strips

Packaging is small, offers optimum protection against moisture and contamination

100

Points

TOTAL

98

Points

Weighting: 45%
*Themaximum score is 100 points

The water hardness test strips from the manufacturer aquaself fulfil the high expectations raised by their advertising promises and are convincing in terms of user-friendliness.
The application is uncomplicated, the comprehensible instructions and the clear colour scale enable a quick and precise evaluation. This corresponds to the advertised claim of user-friendly handling. The quality of the product is also impressive. The resealable packaging protects the strips from moisture and environmental influences, thus helping to maintain product quality. To summarise, it can be said that the water hardness test strips from aquaself live up to their advertising promises.
The product combines user-friendliness, high quality and precise results, thus boosting user confidence. The manufacturer’s expectations are fulfilled. However, a little more helpful information on the health effects would be desirable.

Test plan

You can find a detailed insight into the evaluation criteria of the practical part of the test and the distribution of points here. If you are also interested in the evaluation of our other test criteria, please read our document on the evaluation process.

Price/performance ratio

and ratings from consumers

Finally, we analyse how the product compares to the competition. Can it keep up with the competition in terms of price and quality? Would we generally recommend buying it? We also look at the consumer reviews and check whether the critical and positive reviews are actually justified.

Finally, we analyse how the product compares to the competition. Can it keep up with the competition in terms of price and quality? Would we generally recommend buying it? We also look at the consumer reviews and check whether the critical and positive reviews are actually justified.

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Price / performance ratio

Very good performance in the upper price segment

50

Points

Rating cut

4.3 out of 5.0 on Amazon

65

Points

TOTAL

58

Points

Weighting: 15%
*Themaximum score is 100 points

On the Amazon platform, consumers rate the product with an average of 4.3 stars (as of 27/01/2025). In some cases, it is criticised for being too expensive . On the other hand, the simple and functional handling and the good results are positively emphasised. In our practical test, we were able to confirm that the easy reading and measurement results of the water hardness test strips are well received by customers. However, we can understand consumers’ criticism of the price of the test strip.

Prices of up to €9.99 are charged on the Internet for equivalent products. Very cheap products are available from as little as €5.69 . The water hardness test strips from aquaself are therefore currently in the upper price segment with a price of €9.80. For the quality and performance received, the price-performance ratio is very good.

Overall result

1. packaging & contents

20%

100

Points

2. product processing & appearance

20%

95

Points

3. in the practical test

45%

98

Points

4. price/performance & consumer reviews

15%

58

Points

TOTAL

92

Points

*Themaximum score is 100 points

Water hardness test strips
 of the brand 
aquaself
achieved
92
Points in our test and therefore passed. The test was carried out in the test period
01/25
and is stored in our database under the licence number
241114003
. Further information on our test procedure can be found at www.pruefengel.de/testverfahren.

The practical tests are based on careful observations and do not include long-term or laboratory tests. The test judgements reflect the personal impressions and opinions of the testers who try out the products in everyday use. We would like to emphasise that these evaluations do not claim to be exhaustive and may reflect both subjective and objective impressions. The evaluations are made to the best of our knowledge and belief, without any liability being assumed for the accuracy or completeness of the test results. It is important to note that our tests are not based on legal requirements, medical effects or specific ingredients of the products. We rely on the advertising claims and information provided by the manufacturers, but use of the information is always at your own risk. Our efforts are aimed at ensuring a serious and thorough testing procedure, which has been developed in a long and professional process in close co-operation with our testers.

The practical tests are based on careful observations and do not include long-term or laboratory tests. The test judgements reflect the personal impressions and opinions of the testers who try out the products in everyday use. We would like to emphasise that these evaluations do not claim to be exhaustive and may reflect both subjective and objective impressions. The evaluations are made to the best of our knowledge and belief, without any liability being assumed for the accuracy or completeness of the test results. It is important to note that our tests are not based on legal requirements, medical effects or specific ingredients of the products. We rely on the advertising claims and information provided by the manufacturers, but use of the information is always at your own risk. Our efforts are aimed at ensuring a serious and thorough testing procedure, which has been developed in a long and professional process in close co-operation with our testers.

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Evaluation process

You can find a detailed insight into our evaluation process, which forms the basis for our product ratings, here:

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