90002_42248_10
Subjects
1990s
Color
Story on a special tool which detects hazard material in underground or hard to reach places. WS of two men placing a large rod device down a well. Closeup of laser light changing color when exposed to different chemicals. Vials paint are turned. Scientist in lab and working on computer. Laser inspecting pills. Firefighter using laser to detect hazards chemicals. Blue laser light device held up.