(1) Check the appearance first: the color of the bell shell is bright and uniform, without paint, color change and rubbing marks. The clock surface should be cleaned, the scale is uniform, and the handwriting should be clear.

(2) Check the sensitivity: Start a little bit, and the second hand starts to move around to prove that the sensitivity is high. The bell with high sensitivity continues the time for a long time.

(3) Check the sound of the time: Place the bell, left, back, back and down, and if you walk all directions in all directions, the sound is in line with the same sound and uniform noise, which means that the walking is normal.

(4) Check whether you touch the needle: Dipping the time, the minute hand, so that the time, the minute hand and the second needle coincide (the three needles overlap), and a certain gap should be maintained between the three needles, and it is not allowed to be rubbed. At the same time, there should be a proper gap between needles and clock noodles and glass.

(5) Inspection poorly: Dial the noodles to 3, 6, 9, and 12, respectively, and then dial the clockwise to these places. If the error of the noise is within 5 minutes, the difference is normal.

(6) Check the sound of the alarm; the sound of the alarm should be clear, loud, no dumb, no sound.

(7) Check the tightness of the spoon and the spoon: the tightness should be moderate. If the spoon pine is pine, it means that there is insufficient elasticity of the upper rotation of the center wheel, which will cause a slow phenomenon of seconds and slowness. If the spoon is pine, the downtown will rotate with the time. But if it is too tight, it is not convenient to use