Scientific apparatus and instruments, not for medical use, namely, [ optical mirrors, glass tubes, Erlenmeyer flasks and beakers for scientific purposes, conductivity meters, chromatography columns for use in purification in the laboratory and parts and fittings therefor, spectrometers and parts and fittings therefor, instruments for measuring relative DNA/RNA and protein and parts and fittings therefor, spectrophotometer for measuring relative DNA/RNA and protein, ] cellular mixed ester memb...