493	LABORATORY EQUIPMENT AND ACCESSORIES: BIOCHEMISTRY, CHEMISTRY, ENVIRONMENTAL SCIENCE, ETC.
49304  *	Air Quality Monitoring Equipment and Accessories
49306  *	Baths, Constant Temperature (Hot or Cold): Recirculating, Shaking, etc.
49308  *	Biochemical Research Equipment: DNA Synthesizers, Enzyme Analyzers,Respirometers, etc.
49309  *	Chemical Analysis Systems, Automated: Ion-Sensing Electrode, Micro-Kjeldahl, Titration, etc.
49310  *	Chemical Reactors: High-Pressure (Autoclaves), Catalytic, Fluid-Bed, Photochemical, etc.
49311  *	Chromatographs, Gas
49312  *	Chromatographs, Liquid: High-Performance (HPLC), Preparative, etc., and Major Accessories: Absorbance/Fluorescence 
	Detectors and Monitors, etc.
49314  *	Combustion Analysis Equipment, Automatic (For Carbon, Nitrogen, Sulfur, etc.)
49316  *	Densitometers, Scanning (Gel or Plate Scanners)
49317  *	Desorber
49324  *	Electrophoresis Equipment: Electrofocussing Cells, Gel Driers and Slicers, Power Supplies, etc.
49330  *	Evaporators, Analytical (Air or Nitrogen Jet)
49332  *	Evaporators, Vacuum: Flash, Rotating, etc.
49335  *	Fluorometers and Spectrofluorometers
49338  *	Freeze-Drying and Critical-Point Drying Apparatus
49342  *	Gas Analysis Equipment (For CO2 Oxygen, etc., in Gas Mixtures)
49344  *	Gas Generating and Purifying Equipment: Hydrogen, Oxygen, Ozone, Pure Air, etc.
49350  *	Osmometers
49351  *	Photoionization Analyzer and Lamps
49352  *	Photometers, Flame
49354  *	Photometers, Photoelectric (Colorimeters, Transmittance)
49358  *	Polarimeters
49360  *	Polarographs
49362  *	Sample Collecting, Diluting and Multiple Dispensing Apparatus, Automatic:  Pipetting Machines, etc.
49363  *	Sample Concentrators (For Multiple Samples), Vacuum Type
49369  *	Spectrometers, Emission: Argon Plasma and Conventional
49373  *	Spectrophotometers, Atomic Absorption
49375  *	Spectrophotometers, Infrared
49377  *	Spectrophotometers, Ultraviolet and Visible
49380  *	Tensiometers (For Surface Tension Measurements)
49384  *	Tissue Disrupting, Grinding, and Homogenizing Equipment: Frozen Tissue Pulverizers, Ultrasonic Cell Disrupters, etc.
49392  *	Vacuum Still: Short Path, Spinning Band, etc.
49396  *	Water Quality Monitoring Equipment: BOD Analyzers, Turbidimeters, Well Samplers, etc.