Scientific, research, navigation, surveying, photographic, cinematographic, audiovisual, optical, weighing, measuring, signaling, detecting, testing, inspecting, life-saving and teaching apparatus and instruments, namely, electrodes for laboratory research, surveying instruments, audiovisual receivers, measuring tapes, optical signaling cables, textile testing machines and wearable devices in the nature of wearable activity trackers for scientific use to be worn by a human to gather human bio...