readout instrument造句

In front of the seat, the control panel contains digital readout instruments for the voltage and amp readings of both, the battery and the solar cells.
Being blind, he could not see the measurement, but used a special trick : he placed both the index and middle fingers so that the needle readout instrument should touch his fingers, and so the margin of tolerance were established.
It's difficult to find readout instrument in a sentence. 用readout instrument造句挺难的