Iris Diaphragm with Adjustable Aperture, 3" Outer, 30mm Max Entomology & Zoology_Dissection Double-parallel plastic pulley with two

Double-parallel plastic pulley with two 50mm wheels in a steel frame and end hooks

and a central control module

Wider 70 x 20 x 8mm cross-section on this Alnico bar pair gives a broader pole face than typical bar magnets

this large-capacity polypropylene measuring jug carries raised graduations and tolerates autoclave

5-inch female pelvis model demonstrates 9-month pregnancy anatomy and fetal positioning before delivery for obstetrics teaching

Iris Diaphragm with Adjustable Aperture, 3" Outer, 30mm Max Entomology & Zoology_Dissection Double-parallel plastic pulley with twoAdjustable iris from closed to a 30mm maximum aperture inside a 3 inch black metal body, with a 2. 5 inch mounting rod giving 5 inches total length for standard optical bench setups.