Watch Tuner Timegrapher

Not the most accurate timegrapher, but certainly gets the job done. Its results are not same as when you actually measure over day. However the adjustment you can make are reliable. I.e. you measure with this app and it shows +2s/d. But in fact my watch was running +4. Then using the app I set it to -2s/d. Now my watch is running 0s/d. Does not work with back case on, you need to remove case.

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Initially, I had far more failures than successes in trying to obtain good data from this app. 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. After purchasing a demagnetizer, my watch now appears to be back to normal. 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. 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. 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. 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. I would encourage the developers to revise their instructions to specify use of the earbud microphone only, and not the built in microphone.

Someone put a lot of time and effort into this app. Thank you! If you can read and follow instructions then this app is going to work well for you. It does require some tweaking and experimentation to get an accurate reading from your watch. Be patient. You need dead silence. The app is very sensitive and will pick up the slightest sound like creaks in your chair or your joints popping when you get up and walk away. Mine picked up the dog walking around upstairs. I was able to get my SKX to go from loosing 15 seconds a day to loosing 4 seconds a day. I’m very pleased with that. Once you figure out how to use it you’ll want to regulate everything!! Great job on the app! Highly recommend!!

Everything looks good, but readings are very inconsistent. I’m going to continue doing some testing with various setups. But it’s currently looking as though it’s so inconsistent that it’s almost useless. I’ve been graphing the timing on my watch for a very long time manually. My watch and manual measurements have been very consistent. I know my watch is not going from +24 s/d to -8 s/d and everything in between that this app is telling me. My watch runs at +1.8 secs per day according to my charts I’ve been keeping manually now for 3 months. At 2 months, I predicted exactly what my watch would read one month later. It was spot on. So I know my watch doesn’t vary as much as this app says that it does. I’m going to keep trying though.

So I wanted to check if my SD43 has the amplitude issue ... saw couple of videos about the app ... with tweaking and right settings you can get a decent reading. So for Rolex I put the 28,800 beats and 55 lift angle off movement 3235 and tweaked how to position the Apple microphone under the watch ... tried few times until the sampling became excellent ... well it worked and got decent numbers including the spd (I am using another app for that) and it was close ... very happy ... thank you!