Most modern watches have a lift angle of 52 degrees;. Color: grey+black;. The frequency diagram of the watch can be displayed on the LCD screen;. 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 precise value of the watch;.
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