Iron Cylindrical Hooked Weight, 10-Pack Mass:500g this five-meter retractable tape measure

this five-meter retractable tape measure pairs a 13 mm curved rust-proof carbon-steel blade with a locking control

with a clear Perspex back revealing the internal tube-and-linkage response to pressure

Versatile glycerin reagent used as a microscopy mounting medium

and the triboelectric series

Switchable brightfield and darkfield illumination combines with a 40-400X monocular compound microscope and mechanical stage for versatile specimen study

Iron Cylindrical Hooked Weight, 10-Pack Mass:500g this five-meter retractable tape measureMachined iron cylinder with a top hook and bottom slot for tandem hanging, sold as a ten pack sized for class wide physics experiments on force and Newton's laws.