Iris Diaphragm with Adjustable Aperture, 3" Outer, 30mm Max Entomology & Zoology_Dissection this large-capacity polypropylene measuring jug

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

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

Chrome-plated steel wire stand at 5 x 5 x 5 inches supports flasks and beakers above alcohol burners for classroom chemistry demonstrations

and a central control module

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 this large-capacity polypropylene measuring jugAdjustable 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.