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LABORATORY APPARATUS-NAMELY, COLORIMETERS, COLORIMETRIC COMPARATORS, DEPTH REDUCTION RODS, TEST KITS FOR DETERMINING PH, ELECTRODE PH METERS, TURBIDIMETERS, SOIL TESTERS, ROSIN COLOR COMPARISON STANDARDS FOR BLOOD TESTING, BACTERIA COUNTING APPARATUS, HEMOMETERS , HAEMACYTOMETERS, BLOOD SEDIMENTATION APPARATUS, STALAGMOMETERS, VISCOMETERS, MICROSCOPE COVER GLASSES AND GLASS SLIDES, COVER GLASSES FOR POLARISCOPE TUBES, TUBES, PRISMS, LENSES, AND PLANO-PARALLEL PLATES FOR BLOOD TESTING APPARATUS