The new blocks have no moving parts, using an electronic sensor to detect reaction times instead.

Other types use an electronic sensor in the probe, connected by a flexible heat-resistant cable to a display.

A sensed end-stop uses some sort of electronic sensor to determine when the mechanism has reached track zero.

Electric motors (usually servo motors) are usually controlled by an electronic sensor, and can be more accurately programmed.

They include launching aerial drones to track shark movements and seabed electronic sensors that warn lifeguards when large sharks enter waters near swimmers.