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.
Beckman Aerosolve Tube Racks, Holds 6 Conical 15 mL 17 x 120 mm Tubes Brand NEW Pack of 4 Catalog# 358991 Listed price: $465.91 Color: Lt. Green Molded plastic racks support tubes in Aerosolve® canisters. Open-rack design permits quick inspection for possible broken or leaking tubes.
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