12-Hole Test Tube Stand for Mixed 30mm and 15mm Tubes, Polyethylene Subcategory_Geology Models Pocket-sized 45mm aluminum compass with

Pocket-sized 45mm aluminum compass with a graduated dial

Used to dissipate heat during sustained high-current work

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

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

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 Pocket-sized 45mm aluminum compass withFlat 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.