50-Pack Heavy-Wall Test Tubes with Beaded Rim, 50mL, Borosilicate Glass Racks & Stands_Bottle Stands 6 inches for clean pinhole-imaging

6 inches for clean pinhole-imaging and diffraction studies

Built for scrubbing narrow-diameter glassware

and the alternator principle with stationary inductors

Shows oxygenated and deoxygenated blood paths between heart chambers and alveolar surfaces through seven hand-painted removable parts designed with medical-professional input

ten copper rods at 300 by 3mm matching the geometry of companion iron and aluminum sets

50-Pack Heavy-Wall Test Tubes with Beaded Rim, 50mL, Borosilicate Glass Racks & Stands_Bottle Stands 6 inches for clean pinhole-imagingPack of 50 heavy wall test tubes in borosilicate 3. 3 glass holds 50mL with beaded rim for durable chemistry and laboratory procedures.