Works after finding sweet spot. – Kello Review

At first I could not figure out how to get it to read, I put the microphone of my iPhone 5s on every side of the watch but only was able to get a reading when I put my phone standing up on top of the face of the watch. It only took me 10 minutes of reading and adjusting to get to run within one second for 24 hours. I am setting a Seiko 5 with a 4R36 movement and after 18 hours it is off by a half second. It is best to hack and stop the heart and restart it, it seems to pick up the adjustment better, otherwise it will show a algorithm of fast and slow for 10+ minutes and narrowing to settle in every wave up and down in speed. This is normal. It might be a good idea to let it sit for 30 minutes after adjustment to re read to get a more accurate reading. It is expensive but much cheaper than a real watch regulator and saves the guessing.
Review by Fishhead1227 on Kello.