Bottom Sampling Net for Aquatic Specimens Material_LDPE letting students read image height

letting students read image height and position directly off the projected real image during focal-length investigations

a compound unit for demonstrating multi-rope mechanical advantage in physics activities

Hand-operated vacuum pump with a 200mm copper pump plate and rubber seal

5 inches across flat tips

this clear dial provides a readable face for measuring angular displacement in physics setups

Bottom Sampling Net for Aquatic Specimens Material_LDPE letting students read image heightBuilt for stream and pond bottom sampling, this heavy rim net sifts benthic invertebrates, sediment dwellers, and bottom feeding larvae from aquatic substrates.