| 摘要 |
An object is to provide a very novel and highly practical level in which mass productivity is good, in which the bubble position is easily corrected, and which is advantageous in terms of cost. The level is one in which a mounting body 2 provided with a bubble tube measuring portion 1 in which a liquid and a bubble are sealed is disposed in a container case 3, the mounting base 2 is fixed in a prescribed position that allows the bubble tube measuring portion 1 to be viewed from a window hole 4 provided to the container case 3, and the mounting body 2 is adjusted by microrotation in relation to the container case 3 to correct a position of the bubble sealed in the bubble tube measuring portion 1, wherein a shaft insertion hole 6 that connects and conforms to a through-hole 5 provided in the container case 3 is disposed in the mounting body 2, the mounting body 2 is disposed inside the container case 3, the shaft member 7 is disposed completely via the through-hole 5 of the container case 3, and the shaft member 7 is insertably disposed in a shaft insertion hole 6 of the mounting body 2, whereby the mounting body 2 can perform microrotations about the shaft member 7 in the container case 3; the mounting body 2 is provided with an elastic pressure contact portion 8 for making elastic pressure contact with an inner surface of one side of the container case 3, and a tightening and pressing contact portion 12 for making pressing contact via an adjustment screw 9 for pressing and making contact with the inner surface on an opposite side facing the container case 3, or via the tightening of an adjustment screw 9 against the inner surface on the opposite side facing the container case 3; the adjustment screw 9 is threadably disposed completely through the mounting body 2 from the threaded portion 10 disposed in the side surface of the mounting body 2 inside the container case 3, and is configured so as to make pressing contact from a sloped direction against the inner surface of the container case 3, or is configured so as to press the tightening and pressing contact portion 12 from a sloped direction against the inner surface of the container case 3; and the adjustment screw 9 is threadably operated to vary the amount of elastic pressure of the elastic pressure contact portion 8 by using the amount of threading of the adjustment screw 9, whereby the mounting body 2 is fixed in the container case 3 and the mounting body 2 is adjusted by microrotation in relation to the container case 3 so that the bubble position of the bubble tube measuring portion 1 can be adjusted.
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