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®
Diamond disc.

The cutting disc from rendech® comes in a subtle black matt finish and impresses with its simple elegance.
Proven 10 mm segments ensure a clean cut and a long service life. This grinding wheel meets the requirements of EN13236.
The diamond cutting blade is suitable for reliable cutting of stone, concrete, granite, masonry, clinker, exposed aggregate concrete and much more.
The 125 mm cutting blade is characterized by its stable performance and long service life. All in all, the diamond blade from rendech® offers quality for professional use. Effective cutting is possible with this diamond blade.

Advantages

✅ Manufactured according to EN13236
✅ High cutting performance
✅ Fits all standard angle grinders
✅ 10 mm 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 superfluous packaging materials were used in order to reduce waste.100 points
Package contents & scopeDiamond disk100 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 diamond blade was delivered in a sturdy cardboard box, which was undamaged and easy to open. The diamond blade 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 diamond blade makes a very good impression at first glance. The compact design of the packaging helps to minimize waste and leaves no room for superfluous packaging material or unnecessary advertising flyers.

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 diamond blade is ready for the practical test.

The diamond blade impresses with its pleasant appearance and ease of use. The good workmanship is striking. The diamond blade 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*
Barrel of the cut-off wheelRuns largely smoothly without imbalance90 points
DurabilitySufficient durability90 points
Possible applicationsVersatile application100 points
EffectiveVery effective100 points
PerformanceHigh cutting performance100 points
Total96 points
Weighting: 45%
*The maximum score is 100 points

The diamond blade is very easy to use. It was used with an angle grinder. The cutting itself was quick and easy, with impressive results.
The stable material not only ensures a high load capacity, but also gives the diamond blade a high level of robustness. This is particularly evident when cutting concrete, granite, stone, masonry, brick, exposed aggregate concrete and other concrete products .
The versatility of the diamond blade is demonstrated by its numerous possible applications. The rendech diamond blade is suitable for angle grinders, wall chasers with Ø 125 mm and bore 22, 23 mm. Compatible with: Bosch, Makita, Flex, Einhell, metabo, Parkside, DeWalt and many more. However, it is important to ensure that the size of the diamond discs is adapted to individual requirements . This is the only way to achieve optimum utilization of the diamond blades .
Another outstanding aspect is the durability of the diamond blades due to the high-quality materials. The use of robust diamond promises long-term use without significant wear.
In summary, the diamond blade 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 . The diamond blade is suitable for continuous professional use.

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? We also look at the consumer reviews and check whether the critical and positive reviews are actually justified.

CriterionRemarkScore achieved*
Price / performance ratioVery good performance in the mid-price segment80 points
Rating cut4.6 out of 5.0 on Amazon80 points
Total80 points
Weighting: 15%
*The maximum score is 100 points

On the Amazon platform, consumers rate the product with an average of 4.6 stars. One common complaint is that the diamond blade wears out relatively quickly. Many customers like the fact that it was very easy to use. In our practical test, we were able to confirm that the sharpness and cutting performance were very good.

Prices of up to €21 are charged on the Internet for equivalent products. Very inexpensive products are available from as little as €4 . The diamond blade from rendech® is therefore currently in the mid-price segment with a price of €11.99 (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%80 points
Total93 points
*The maximum score is 100 points
Diamond disc.
 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
240102003
. 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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