| 摘要 |
PURPOSE: To confirm a charging level by visual inspection by indicating amounts of residual liquid filled in an opaque container. CONSTITUTION: A movable plate 3 adapted to follow up fluctuations of liquid level is provided in a non-magnetic opaque container 1 and a magnet 7 is attached to an end of the plate 3, close to the inner wall of the container 1, and a magnet viewer sheet 8 is bonded to the external surface of the container 1 in a direction normal to the plate 3, thereby to display the image of magnetic flux on the sheet 8 by exciting the magnet 7, whereby the level of liquid in the container can be confirmed by visual inspection from the outside of the container 1. |
