But, to its credit, even though its at least 20 yrs old now, the Suunto is still an accurate timepiece.

The barometer is useful for the weather aspect. Around the house, what's the point of wearing a bulky watch? The highest 'mountains' around here measure maybe 500 meters. But these days I almost never wear it because I almost never get to go hiking. My current watch (a an old Suunto Vector) does much better than most watches, it gains maybe one or two seconds a month. Curled wire for mechanical isolation I suppose. Seems to be a piezo element, fixed to the metal thing that sticks out of the microphone assembly. Modern design compared to other watch analyzers I have seen. The display is colour LCD, 480x272 pixels. A closer look at the microphone assembly. The red wire is ground, black is +8V Yellow is signal. Notice the threaded metal inserts for the screws, also for the PCB screws. If anyone knows anything about this, please let us know Inside the unit, slightly more interesting. The USB calibration port is for factory use. This watch runs 18.2 seconds per day fast Unexciting back of the unit. It can be rotated in two axes for testing the watch in different positions. Even the firmware seems good Anyway, here it is: The watch is clamped to the microphone assembly. Quite impressed with the design and build quality on this thing. It does this by listening to the sound of the movement and then interpreting the signal. It is for analyzing the performance of mechanical watches. AND if you can, make audio pickup better, and/or find and recommend mics that have been tested to work with 'most' watches.Just got this from China through eBay. Would like to see the 'instantaneous' reading and the 'average over xx amount of time.perhaps since measuring began? Not sure how it's done now, but the reading was +/- 10 and seemed to fluctuate steadily between them. the reading needs to be 'averaged' over a minute or two. It couldn't find a 'pulse' to measure in my Automatic Seiko wrist watch l, 7S36 movement, UNTIL I ditched the external mic, took the iPhone 5 out of the case and used the built in mic. Got it to work fine with my 'loud' Clock and external headphone/mic. Tried iphone mic, ipad mic, external Sony headphone mic, buried under pillows and in bowls, cupped in my hands, taped the mic to it.! Had a 4star from me, but I got a new Tissot T-Race, bugger ticks like a clock, can't The app appears to be very accurate when you find the combination of hardware that works for you. On a submariner style, it was placing the mic on the crystal, on a day/date watch it was on the back of the case, on another it was the side of the case around the 9 o'clock position, etc. I have used the app to regulate four mechanical watches so far and as another reviewers noted, you have to find the 'sweet spot' on the watch, which was in a different spot one each timepiece. The combination that did the trick for me was, as mentioned previously, using the iPad 3, a mic/speaker cable from a Galaxy 5S (no idea where my iPhone cable is but it would probably produce similar results) and placing the watch atop a closed cell neoprene mousepad and a cloth covered foam watch band separator that came with a watch case. I tried the app on my iPad 3 and found it works much much better. When I could get it to work, the app seemed to be very accurate. I was occasionally able to get the app to work with my iPhone 5s using the internal mic but never with the mic/speaker cord.

Witschi watch timegrapher microphone