50-Pack Heavy-Wall Test Tubes with Beaded Rim, 50mL, Borosilicate Glass Racks & Stands_Bottle Stands supplied in five colors at

supplied in five colors at two leads per color so paired wiring stays color-coded across both sides of a circuit

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

this intermediate travelling microscope slides a cast iron carriage and swing-over magnifier for precision measurement in school and college labs

6 inches for clean pinhole-imaging and diffraction studies

Reading both light and heavy liquids on a single dual-scale stem from 0

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