WeiShi No.1000 Multifunctional Professional Timing Timegrapher Mechanical WRUX

It is a watch tool that can be used for both repairers and hobbyists. The sampling period can be selected by 2 seconds, 4 seconds, 6 seconds, 8 seconds, 12 seconds, 20 seconds, 30 seconds, 60 seconds, and the average value of corresponding period will be regarded as the exact value of the watch.