Comparison : Item # QCH-12-1, QCH-12 Column, Chromatography, With Reservoir and Standard Joint
Item # QCH-12-2, QCH-12 Column, Chromatography, With Reservoir and Standard Joint
Item # QCH-12-3, QCH-12 Column, Chromatography, With Reservoir and Standard Joint
Item # QCH-12-4, QCH-12 Column, Chromatography, With Reservoir and Standard Joint
Item # QCH-12-5, QCH-12 Column, Chromatography, With Reservoir and Standard Joint