Kello

Bose microphone resting on case back of very loud pocket watch. I get a perfect wave graph but then it suddenly says that the signal is unstable. It also keeps changing it's mind on the frequency. One time it's 16200, then next time it's 14000 on the same time piece! I've tried it with 3 watches and with both the Bose and internal mic and get the same results in a perfectly quiet room. I'm going to contact Apple Store to request a refund.

I had spent too much time try to regulate a Seiko 7s26 c movement so I thought I'd try this app. I spent $14 CDN and 2 hours. The best result I could achieve using iPhone 6s headphone/mic was UNSTABLE. I had to manually set the both to 21600. I tried with case back on/off. I could achieve 5 dot fidelity and a saw tooth wave only with back off and mic resting in the movement. Now that the case back has been off for 2 hours and the mic and my fingers have touched the movement I doubt the watch will run for a long time and it is still not regulated. Looks like I'm out $14 bucks for the app and probably $50 for the watch.

May 2016. No longer picks up mike poor signal. Worked before

15 minutes in a quiet room, two different microphones and no results. Give me my money back!

I find the reading from this app pretty accurate when I compared it with a witschi watch expert 2!

This app has always worked for me. I have been able to regulate my mechanical watches with this. The rate it displays agrees with the rate the watchmaker determines, it also agrees with the rate calculated by measuring how much the watch drifts over a week. It works with the factory mic as well as aftermarket. I have to turn the volume way down to avoid clipping the peaks. It is very usefully for a quick test on newly purchased watches. I have had no problems at all with this app. It is very impressive.

I want m'y Money back

Make sure to adjust your mic volume all the way up or it wont work!!! Wow this app works exactly as they say. I just timed my old Rolex Submariner 1680 with the microphone that came with my iPhone 4. It came back with +4.3 seconds per day. Amazing. It had no problem reading the beat rate even though I wasn't in a super quiet environment for this initial test. If anyone has problems with this app then try a different microphone as the instructions say. This works 100% everytime for me and the results are exactly the same as my friends $1000 timing machine that last time I checked it said +4.6 seconds per day. Awesome!

Works with difficulty with the external microphone of the iphone, even when you keep it stuck to the watch (or it doesn't work at all)... and it crashes really often !!

This app is incredible. It can be a bit fussy if you don't follow the user instructions but as long as you give it the right amount of time in a quiet space it does exactly what it says it will do! Bravo!