Scientific, research, optical, measuring, signaling, detection, testing, apparatus and instruments, namely, electronic chips for the manufacture of integrated circuits, electronic detectors, integrated circuits, photometers, printed circuits, semiconductors and electronic data recorders for detecting and measuring photoplethysmography (PPG) signals for heart rate (HR), oxygen level (SpO2) and other vitals, for detecting and measuring low light imaging photonics, and for detecting and measurin...