These are high form porcelain crucibles with lid covers.
These 7-315 series are crucibles with lids that are used with chemical compounds that may be heated in high temperatures.
These Borosilicate Glass Cylinders come with removeable stands for added stability and a bumper guard to prevent breaks.
This is a replacement Kjeldahl bulb for any distillation apparatus equipment.
These porcelain evaporating dishes are completely glazed inside and outside except for the bottom.