PURPOSE: To shorten the stroke of a lifting gear and enable to move a water examination instrument to a safe position by making the instrument rotatable round a rotation axis that is along the longitudinal direction of the arm of the instrument and the direction of lifting of the lifting gear.

CONSTITUTION: A column 5 is installed vertically on the base 4 of a lifting gear, and this column is provided with the lift frame 7. On this lift frame 7 a worm shaft that is connected as one body to a rotating handle 12 and a gear box 11 that has a worm-wheel in itself. On the worm-wheel an arm 16 is fixed and a water examination instrument 3 is mounted through a bracket 9. Also the column 5 is supported by the base 4 through a bearing 17 and rotated by a lift handle 18. With this constitution, the water examination instrument 3 can be lifted up and down by the lift handle 6, and at the same time it can be also rotated round a rotation shaft that is along the longitudinal direction of the arm 16 by means of a rotating handle 22, and, further, since the column 5 can be rotated by the handle 18, the water examination instrument can be moved to any position.