9 Optical instruments for measuring a reaction by monitoring changes in the reflection of light, namely, interferometers; imaging instruments for use in the study of biomolecules, including proteins, ligands, and nucleic acids, for research purposes; imaging instruments for measuring binding of molecules to determine antibody affinity to an antigen for research purposes; imaging instruments for measuring binding of molecules to determine receptor-ligand binding for research purposes; laboratory instruments in the nature of interferometers for use in collecting real-time measurements to support the analysis of biological molecules at different stages of therapeutic development, not for medical use; probes for scientific, research, or diagnostic testing purposes, not for medical use; laboratory instruments in the nature of surface plasmon resonance (SPR) tools for label-free analysis of biomolecules for scientific, research, or diagnostic testing purposes, not for medical use; probes for scientific, research, or diagnostic testing purposes, not for medical use, namely, probes to which biomolecules bind over the course of a scientific, research, or diagnostic testing procedure; probes for scientific, research, or diagnostic testing purposes, not for medical use, namely, probes to which biomolecules bind while performing polymerase chain reaction (PCR) as part of a scientific, research, or diagnostic testing procedure; probes for scientific, research, or diagnostic testing purposes, not for medical use, namely, probes to which biomolecules bind while performing genetic sequencing as part of a scientific, research, or diagnostic testing procedure; probes for scientific, research, or diagnostic testing purposes, not for medical use, namely, probes to which biomolecules bind while performing an enzyme-linked immunosorbent assay (ELISA) as part of a scientific, research, or diagnostic testing procedure; interferometric sensors in the nature or interferometers; interferometric instruments in the nature or interferometers for use in scientific, research, or diagnostic procedures; fluorescent sensors for scientific use; fluorescent instruments for use in scientific, research, or diagnostic testing procedures, not for medical use, in the nature of fluorescent sensors; chemiluminescent sensors for scientific use; chemiluminescent instruments for use in scientific, research, or diagnostic testing procedures, not for medical use, in the nature of chemiluminescent sensors; optical instruments for scientific use, namely, biomolecular interferometry (BLI) instruments for analyzing biomolecules in samples without using fluorescent markers