50-Pack Assorted 1-Hole Rubber Stoppers, Acid and Alkali Resistant Subcategory_Test Strips Thirteen-place hardwood test tube rack

Thirteen-place hardwood test tube rack combining seven 19-mm holes and six 25-mm holes with six draining pins for mixed-size tube storage in student laboratories

Two-neck multiple adapter in borosilicate glass features 19/26 socket and 34/35 cone for multi-component chemistry apparatus connections

swim bladder

Half-size digestive system model fits smaller class benches while preserving the full esophagus-to-rectum path and accessory organ anatomy in two removable parts

Cutaway hand-powered Wankel rotary model at 8 by 7 by 3

50-Pack Assorted 1-Hole Rubber Stoppers, Acid and Alkali Resistant Subcategory_Test Strips Thirteen-place hardwood test tube rackPack of 50 assorted one hole rubber stoppers with 5mm hole provides acid and alkali resistance for laboratory vessel sealing with tubing pass through.