| 摘要 |
<p>The present invention includes a damping cup, a measuring section having an ultrasonic converter extended into the damping cup vertically, and installed in the bottom end area and at least one waiting room, a stable structure is installed in at least a part of the waiting room, and according to the present invention, a part of the waiting room including the stable structure is opened over a broad area toward the upper part and connected to a vent at the top of the device through a venting channel.</p> |
