Optical apparatus and instruments, namely, fluorescence photometry and lab-on-a-chip image detector; densitometers, namely, densitometer for measuring the density of nucleic acid, virus, and bacteria for scientific use; saccharometers; testing apparatus not for medical purposes, namely, laboratory glassware for the isolation of nucleic acid; testing apparatus not for medical purposes, namely, laboratory isolator for the isolation of nucleic acid; testing apparatus not for medical purposes, na...