Scientific, research, navigation, surveying, photographic, cinematographic, audiovisual, optical, weighing, measuring, signaling, detecting, testing, inspecting, life-saving and teaching apparatus and instruments, namely extensometer, telejoint meter, radar, laser, motion sensor, video and alarm devices all for monitoring, alerting, recording and reporting information on natural and environmental hazards; electrical apparatus and instruments, namely, extensometer, telejoint meter, radar, lase...