Vaqtni hisoblash mashinasi - Watch timing machine
![](http://upload.wikimedia.org/wikipedia/commons/thumb/d/d4/Watch_timing_machine.jpg/300px-Watch_timing_machine.jpg)
A soatni hisoblash mashinasi tomonidan Vibrograf.
A soatni hisoblash mashinasi a shomillarini akustik ravishda o'lchaydigan mashinadir tomosha qiling shuning uchun uning aniqligi o'lchanishi va samarali sozlanishi mumkin.
Ushbu kompaniyalar soatni hisoblash mashinalarini ishlab chiqaradilar: