You could magnetize your watch in a different way. TIMEX Retro Digital Wrist Watch User Guide W116 555-095000-03 8.24. The ear pod microphone has a magnet in it but it is NOT strong enough (~200 microTeslas) to magnetize the watch nor to affect the watch magnetically. CASIO Wrist Watch User Guide CASIO Wrist Watch Charging the Watch While wearing the watch. I'm sorry that the app doesn't work for you. I would encourage the developers to revise their instructions to specify use of the earbud microphone only, and not the built in microphone.
Once you are finished, download your custom routine to your Workout Watch. Choose your exercises from our pre-defined list or create your own.
Also, keep in mind that the earpieces of the earbuds emit a strong enough field to affect a compass needle, so keep the earpieces away when using the microphone. The unique Workout Watch software combined with the Timex Ironman Datalink USB watch allows you to create and modify an unlimited number of personalized workout routines directly on your computer. 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.