(1) First check the appearance: the color of the clock shell is bright and even without peeling paint, discoloration and scratches. The clock face should be clean, with a uniform scale and clear writing.
(2) Check the sensitivity: Start the spring a little, and the second hand will start to move, which proves that the sensitivity is high. A high-sensitivity clock has a longer duration.
(3) Check the running time sound: Place the clock face left, right, front and back, up and down, if the sound is consistent when walking in all directions in all directions, even if there is no noise, it means that the walking is normal.
(4) Check whether the needles are touched: turn the hour and minute hands to make the hour and minute hands coincide with the second hand (three needles overlap), and a certain gap should be maintained between the three needles to prevent rubbing. At the same time, there should be a proper gap between the needle and the clock face and the glass.
(5) Check the alarm: dial the alarm surface to 3, 6, 9, 12 respectively, and then dial the hour and minute hands to these places. If the alarm error is within 5 minutes, the alarm is normal.
(6) Check the alarm sound; the alarm sound should be clear and loud, without mute or empty sound.
(7) Check the tightness of the needle and spoon: the tightness should be moderate. If the needle spoon is loose, it means that the spring force of the compression spring on the center wheel is insufficient, which will cause the phenomenon that the second hand moves and the hour and minute hands do not move or move slowly. If the key is loose, the dial surface will follow the hour and minute hands. But if it is too tight, it is not convenient to use.