![]() ![]() An iPhone appears to be a bit safer since the speakers and microphone are on opposite sides of the device, but caution would still be wise. Although microphones do not create strong magnetic fields, speakers do create strong fields, and the speakers on an iPad are directly adjacent to the built in microphone. ![]() I also purchased an earbud with a microphone, and am having more success obtaining reasonably accurate results, keeping in mind that this is an inexpensive hobbyists tool rather than a professional tool costing hundreds of dollars. ![]() After purchasing a demagnetizer, my watch now appears to be back to normal. Even worse, when using the built in microphone of my iPad, it magnetized my watch, causing a watch that typically runs at -1.1 sec./day to gain about 40 seconds in a day, and then to run about 5 sec./day slow. Initially, I had far more failures than successes in trying to obtain good data from this app. ![]()
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