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4 way arrow
I think the answer is "pointer"
the move pointer
The pointer is lose.
To use a triple beam balance scale, place the object to be weighed on the pan and adjust the sliding weights on each beam until the pointer is at zero. Then, move the larger weight on the first beam until the pointer reaches zero again. Finally, move the smaller weight on the second beam until the pointer is at zero one more time, and the total weight is displayed.
The pointer on a meter moves in response to changes in the quantity that the meter is measuring. For example, in a water meter, the flow of water causes the pointer to move. In an electricity meter, the amount of electricity being used will cause the pointer to move.
A pointed finger/hand
To move the pointer on a microscope, you can adjust the mechanical stage controls that move the slide horizontally and vertically. Simply turn the knobs in the desired direction to position the pointer over the area of interest on the specimen slide.
All you need to do is just press the arrow keys and the cursor will move in the direction of the arrow that has been pressed. If you press and hold the one of the Shift keys at the same time, then it will also select cells as the cursor moves.
the mouse pointer turn to arrow
the move pointer
The mechanical pointer meter operates off a slug and a coil to move the pointer