Magnetic Tool

298 reviews
Content rating
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About this app

Magnetic Tool is now part of the new Ref Tools app, our essential, all-in-one mobile app for air conditioning and refrigeration technicians. Ref Tools gives you access to the tools, guidance, support, and information you need—on the job and in the field.

Download Ref Tools to access the latest version of Magnetic Tool.

Ensuring that a solenoid valve coil is working properly, or detecting a faulty one, is an important step in many repair or installation projects. Magnetic Tool makes testing a solenoid valve coil quick and easy. Just open the app, hold your smartphone up to the solenoid coil you want to test, and watch for the wheel in the app to start spinning. If it rotates, your solenoid valve is good to go.

If a solenoid valve is in a tough-to-reach space, you can also set Magnetic Tool to provide audio or haptic (or both) feedback when it detects a magnetic field. That way, you can check on a valve without seeing your screen, so you can maneuver your phone any way you need to.

Magnetic Tool has two modes: Simple and Advanced. With Simple mode, all you need to do is open the app and start testing—it's that simple. Advanced mode allows you to adjust the threshold tolerances of the magnetometer, which is most often used to reduce or eliminate interference from other nearby solenoid valves.

Magnetic Tool is part of the Danfoss CoolApps Toolbox, a collection of mobile apps designed to help installers and service technicians with their daily tasks. See the full collection at

For app support, please use the in-app feedback function found in the app settings or send an email to

Engineering Tomorrow
Danfoss engineers advanced technologies that enable us to build a better, smarter and more efficient tomorrow. In the world’s growing cities, we ensure the supply of fresh food and optimal comfort in our homes and offices, while meeting the need for energy-efficient infrastructure, connected systems and integrated renewable energy. Our solutions are used in such areas as refrigeration, air conditioning, heating, motor control and mobile machinery. Our innovative engineering dates back to 1933 and today, Danfoss holds market-leading positions, employing 28,000 people and serving customers in more than 100 countries. We are privately held by the founding family. Read more about us at

Terms and Conditions apply for use of the app.
Updated on
May 4, 2021

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298 reviews
Peter Gilbert
July 13, 2022
I said how could this work, but a colleagu uses it so decided to give it a try. Yea, too goo to be true. I've had it say something was running when it was off (computer system said it was off and so did my eyes) and just now it said something was off when it was on (computer sysem showed it running and I can hear the motor going). 3rd shift used and already giving false readings.
1 person found this review helpful
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Danfoss A/S
July 19, 2022
Thanks Peter for sharing your feedback, and sorry to hear about your bad experience. Try enabling advanced settings and adjusting the thresholds a bit to make sure you don't detect any background magnetic activity. However, we acknowledge that a phone magnetometer does not always give perfect readings, which impacts the quality of the results.
Stan Gatus
July 9, 2020
Bloody hell! I never thought that I don't have to use a conventional solenoid valve tester anymore. It makes my commissioning life easier. I don't have to peek on the display to check if my solenoid is energized. Just hearing the sound and vibration is enough! Thank you very much Danfoss!!!
18 people found this review helpful
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Danfoss A/S
July 14, 2020
Hello Stan, We are happy to hear that we are able to help you out! That is exactly why we created the tool. Thank you for taking the time to rate the app. If you have any other feedback or if you have any good ideas on how we might improve the app please let us know either here or by mail to
A Google user
March 4, 2020
I just tried the Magnetic Tool and It did actually work! For those of you who say it doesn't work may I suggest that you take the case off and try. You have to be almost on the valve for it to work at least for me. Neat little gadget. Thanks Danfoss!
8 people found this review helpful
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Danfoss A/S
March 6, 2020
Hi Marko, Thank you so much for your feedback. It is nice to see that you like the app! Thank you for the neat little trick for our other users. Please do not hesitate to get back to us with any suggestions for improvements, as we strive to improve the app every day.

What's new

- General improvements and bug fixes