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.

rendech®
Professional diamond cup wheel

The professional diamond cup wheel from rendech® presents itself as a simple cup wheel in elegant mattblack.
The 125 mm diamond cup wheel is perfect for grinding concrete, screed, tile adhesive, masonry, plaster and other concrete products. The diamond wheel is manufactured in accordance with EN13236.
A clean grinding pattern is achieved thanks to the 2-row segments, which ensure a high surface performance.
The robust design has an overall height of 21 mm. Overall, the professional diamond cup wheel from rendech® offers professional quality for professional use. Effective grinding and milling is possible with the cup wheel.

Advantages

✅ Effective grinding
✅ High stock removal rate
✅ Fits all standard angle grinders, including
✅ 2-row segments

Disadvantages

❌ None

The first impression

Packaging and contents

ℹ️ 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?

CriterionRemarkScore achieved*
Product protectionCarton is sturdy, product sufficiently protected100 points
Sustainability PackagingNo unnecessary packaging waste was produced100 points
Package contents & scopeCup wheel100 points
Instructions for useProduct is largely self-explanatory, brief instructions would be desirable90 points
Total98 points
Weighting: 20%
*The maximum score is 100 points

The cup grinding wheel was delivered in a sturdy cardboard box, which was undamaged and easy to open. The cup wheel was packed in product packaging, which protects the product from damage and thus ensures comprehensive product protection. Brief instructions for use would be desirable, although the use is self-explanatory for professionals. The product packaging is fully recyclable. The cup wheel makes a very good impression at first glance.

The first time in your hand

Product processing and appearance

ℹ️ 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?

CriterionRemarkScore achieved*
Visual appearanceVery good visual appearance100 points
ProcessingVery good workmanship100 points
StabilitySufficient stability100 points
Sustainability of the productNo information on sustainability, but high-quality and durable materials70 points
Total93 points
Weighting: 20%
*The maximum score is 100 points
The cup wheel is ready for the practical test.

The cup wheel has a pleasant appearance and is easy to handle. The workmanship is very good and the grit material is diamond. The cup wheel is stable and dimensionally stable, which indicates a long service life. The manufacturer has not provided any further information regarding sustainability .

This is what our practical test showed

Does the manufacturer keep its advertising promises?

ℹ️ 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.

CriterionRemarkScore achieved*
Heat developmentYou should keep an eye on the temperature of the cup grinding wheel.90 points
DurabilitySufficient durability90 points
Possible applicationsVersatile application100 points
EffectiveVery effective100 points
PerformanceHigh removal rate100 points
Total96 points
Weighting: 45%
*The maximum score is 100 points

The cup wheel is very easy to use. It was used with a Rockwell sanding machine. The sanding itself was quick and easy, with impressive results.
The stable material not only ensures a high load-bearing capacity, but also gives the cup wheel a high level of robustness. This is particularly evident in precision grinding and milling .
The versatility of the diamond cup wheel is demonstrated by its numerous application options. With smooth running, the cup wheel is perfect for grinding concrete, screed, tile adhesive, masonry, plaster and other concrete products. However, it is important to ensure that the cup wheel size is adapted to individual requirements . This is the only way to achieve optimum utilization of the cup wheels .
Another outstanding aspect is the long service life of the cup grinding wheel due to the high-quality materials used. The use of robust diamond as the grit material promises long-term use without significant wear.
In summary, it can be said that the cup grinding wheel from rendech® is a well thought-out, stable and aesthetic solution for a wide range of applications that meets expectations in terms of quality and functionality .

Price/performance ratio

and ratings from consumers

ℹ️ Finally, we examine 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?

CriterionRemarkScore achieved*
Price / performance ratioVery good performance in the mid-price segment80 points
Rating cut4.5 out of 5.0 on Amazon75 points
Total78 points
Weighting: 15%
*The maximum score is 100 points

On the Amazon platform, consumers rate the product with an average of 4.5 stars. One common complaint is that the cup wheel wears out relatively quickly. Many customers like the fact that the cup wheels are very effective. In our practical test, we were able to confirm that the sanding results were very good.

Prices of up to €48 are charged on the Internet for equivalent products. Very inexpensive products are available from as little as €14 . The professional diamond cup wheel from rendech® is therefore currently in the middle price segment with a price of € 21.99 (for 125 mm). For the quality and performance received, the price-performance ratio is very good.

Overall result

WeightingScore achieved*
1. packaging & contents20%98 points
2. product processing & appearance20%93 points
3. in the practical test45%96 points
4. price/performance & consumer ratings15%78 points
Total93 points
*The maximum score is 100 points
Professional diamond cup wheel
 of the brand 
rendech®
achieved
93
Points in our test and therefore passed. The test was carried out in the test period
01/24
and is stored in our database under the licence number
240102004
. 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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Our product evaluations are carried out exclusively through direct, on-site tests. This ensures a detailed and specific examination of the product properties. You can find more information about the test procedure here.

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