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.

ISOTRONIC
Animal repeller

The ISOTRONIC animal repellent made a very good impression in our test. The product can be used in many places , e.g. in the garage, in the loft, in cars or even in stables and barns. The device works with high frequencies and interval switching. Due to its small size and battery operation, it can be used anywhere. The high-pitched sound is perceived by cats, but does not disturb them. Horses do not react to the high frequency, so it can be used in stables. Environmental protection and animal welfare are particularly important to the manufacturer, which is why no chemicals are used and the rodents are driven away without killing them. The manufacturer also emphasises that the company is a German company based in Baden-Württemberg . The device was also researched and developed in Germany.

Advantages

✅Versatile in use
✅Small device
✅No habituation effect
Gentle on animals
✅German company

Disadvantages

❌Not splash-proof

The first impression

The packaging and labelling

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 ensured.

CriterionRemarkScore achieved*
Product protectionCarton is sturdy, product sufficiently protected100 points
Sustainability PackagingUnnecessary packaging waste was avoided, items were packed compactly97 points
Product labellingLabelling on carton and product available100 points
Total99 points
Weighting: 15%
*The maximum score is 100 points
Tiervertreiber
Animal repeller
Packaging

The animal repeller was delivered in a standard cardboard box. This was undamaged and easy to open without tools. The device was protected by a paper wrapping, as was the small screwdriver supplied and two cable ties for attaching the device. The battery, a Velcro strip for possible attachment and the instructions for use were enclosed loose in the box. The entire packaging is easily recyclable.
Product protection was the top priority during despatch so that the product could be delivered in perfect condition .

After unpacking

Package contents and instructions

ℹ️ Most people’s first impression after unpacking is immediately memorable. Are the contents of the pack complete and does the manufacturer make it as easy as possible for me to use the product straight away?

CriterionRemarkScore achieved*
Package contents & scopeBattery, screwdriver and fastening material included100 points
Instructions for useMultilingual, clearly written93 points
Contact informationIn the instructions and on the product95 points
MiscellaneousFastening material (Velcro and cable ties)100 points
Total97 points
Weighting: 15%
*The maximum score is 100 points

After unpacking, there were four things on the table. In addition to the device itself and the battery, there were two cable ties, a Velcro fastener to hold it in place and the instruction manual. The latter explains the handling of the product in nine languages and provides installation instructions. There were also various instructions for use on the product packaging. The company’s address is given and the e-mail address can be found by scanning the QR code on the packaging. Unfortunately, the customer has no way of contacting customer service by telephone . As the product was delivered undamaged and without unnecessary packaging waste, we are talking about a very customer-friendly and environmentally friendly way of sending a product.

The first time in your hand

Product processing and appearance

ℹ️ Before we start the practical test, we take a close look at the product processing. How high quality are the materials used? Is the look and feel satisfactory?

CriterionRemarkPoints achieved*
Visual appearanceGood visual appearance100 points
ProcessingLightweight plastic housing, no sharp edges or corners80 points
StabilityProduct stable and very light100 points
Sustainability of the productNo labelling of sustainability60 points
Total85 points
Weighting: 20%
*The maximum score is 100 points
Tiervertreiber
Animal repeller

The animal repeller is made of plastic with a small button to activate the high-pitched sounds. The batteries supplied can be placed in the device using the small screwdriver that is also included. Opening the battery compartment with the mini screwdriver is not so easy. You should use your own Phillips screwdriver here.
The plastic used is easy to grip and has no sharp corners or edges. Overall, the product makes a very good first impression. Unfortunately, there is no sustainability classification. The sustainability aspects of the manufacturing process are not apparent, at least not to the end user.

This is what our practical test showed

Does the manufacturer keep its advertising promises?

ℹ️ Our practical test is the most relevant and therefore the most important. 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*
UsabilityEasy to use, also suitable for non-professionals90 points
Disturbance of other animalsNo interference observed95 points
VolumeNot perceptible to humans90 points
FasteningSimple, safe, fast100 points
Total94 points
Weighting: 30%
*The maximum score is 100 points

We enjoyed using the animal repeller during testing. The product is a small and handy device that can be used in a variety of ways. We were also impressed by the reaction of our pet cat, which reacted to the high-frequency sound but was not frightened. The animals also remained calm when the device was used in the horse stable. No sound was perceptible to the human ear during the test.
The product can be attached easily and securely thanks to the mounting materials supplied. It can be placed in a selected location even more easily. Thanks to its handy size, the device is unobtrusive.

Price/performance ratio

and ratings from consumers

ℹ️ Finally, we look at 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 analyse consumer reviews and check whether the critical and positive reviews are actually justified.

CriterionRemarkScore achieved*
Price / performance ratiovery good100 points
Rating cutNot rated, as there are still too few customer reviews
Total100 points
Weighting: 20%
*The maximum score is 100 points

Prices of up to €36.75 are charged on the internet for equivalent products. Cheaper products are available from €23.90. The pet repeller from ISOTRONIC is currently in the lower price segment with a price of €24.95. The price ratio is very good for the quality and scope of services you get.

Overall result

WeightingScore achieved*
1. packaging & labelling15%99 points
2. package contents & instructions15%97 points
3. product processing & appearance20%85 points
4. in the practical test30%94 points
5. price/performance & consumer reviews20%100 points
Total95 points
*The maximum score is 100 points
Animal repeller
 of the brand 
ISOTRONIC
achieved
95
Points in our test and therefore passed. The test was carried out in the test period
10/22
and is stored in our database under the licence number
220912178
. 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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