So maybe there were special sensors in this room.

In fact it requires special sensors that are difficult to obtain, and quite expensive.

Such systems use special sensors to "listen" for knock, which can damage the engine.

This is detected with a special sensor in the exhaust manifold.

Now he will have to outfox Pentagon planes equipped with special sensors.

Ahead, the gate loomed large to the special sensors.

Each were equipped with special sensors to find tanks.

A special sensor is placed on the muscle to be measured.

They had special sensors for that, because the eruption of energy, during the final spasm, would be blinding.

The photograph in camera may be made on film or, if it is a digital camera, using a special electronic sensor.