He turned to thermal sensors, but the plain's temperature showed no signs of variation.

Even the most primitive thermal sensor should be able to see them sitting here with hot engines.

"Oh, all the people and beasts in these hills will show up on their thermal sensors, once they start aiming them in the right direction."

At a point that would be a few meters away from the first, the thermal sensors had picked up another source of body heat.

Well," Gutierrez said slowly, "they're pretty damned effective against straight thermal sensors.

Won't the horses show up on thermal sensors?

Throw a switch or connect thermal sensors so that as you walk through each room you "turn on" your home.

Justin kept his rifle at the ready, movement and thermal sensors tuned.

He'd have to switch to the thermal sensor, one of his favorite toys.