Dental Examination Cleaning Kit - Set of 4 - (Professional Instruments) This Set Includes: Mirror Handle Mirror No.5 Single Ended Explorer No.23 Single Ended Probe No.9
Humboldt State University ® Department of Chemistry Robert A. Paselk Scientific Instrument Museum The Chemical Refractometer 1874 - 1970 Richard A. Paselk, Curator Refractometry has been a major tool in the chemical laboratory to determine concentrations of solutions and as an aid in identifying unknown substances since the late nineteenth century.
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