Class B Beaded Rim Volumetric Flask, 25mL, Single Graduation, Borosilicate Glass Lab Equipment_Lab Burners 8mm rod attachment and a

8mm rod attachment and a centered 50mm aperture together hold a lens square against an optical-bench rail for repeatable refraction

6A with constantan winding on a 300x44mm vitreous-enameled tube and a slide-bar carriage carrying a phosphor-bronze contact

Holds 50mm-diameter lenses upright on a free-standing wooden base

offered as a safer substitute for the lead-containing PH0112FCB set

and repulsion

Class B Beaded Rim Volumetric Flask, 25mL, Single Graduation, Borosilicate Glass Lab Equipment_Lab Burners 8mm rod attachment and aClass B volumetric flask in borosilicate 3. 3 glass holds 25mL with beaded rim and single graduation for general purpose volumetric measurement.