12-Hole Test Tube Stand for Mixed 30mm and 15mm Tubes, Polyethylene Subcategory_Geology Models Beech wood test tube rack

Beech wood test tube rack holds 12 tubes up to 20mm diameter in a 9-inch frame for organized storage during chemistry and biology experiments

supplying the standard short-reach patch wire for student-built 4mm-socket circuits at the bench

Molded black plastic replacement knob sized for the goggle sanitizer cabinet timer switch

7 oz with a threaded removable brass hook

5-inch plastic moment-of-inertia disc on a magnetic-base ball bearing

12-Hole Test Tube Stand for Mixed 30mm and 15mm Tubes, Polyethylene Subcategory_Geology Models Beech wood test tube rackFlat pack polythene test tube stand with six 30 mm and six 15 mm holes, disassembling for easy cleaning between uses in chemistry classrooms and student laboratories.