HANDHELD THERMAL IMAGING Unlike “night vision” devices that require a low level of light, thermal imagers can see clearly in complete darkness and through smoke, dust, and fog—even daytime foliage and other obscurants—as actual thermal images show. Our handheld thermal imagers “see the unseeable” and can make all the difference both in routine operations and in critical tactical situations, which often require fast and informed life-or-death decisions by law enforcement officers, firefighters, security personnel, or other first responders.