US$ 10.99
75-inch aluminum-and-steel frame for mass-comparison work
Pairing a hinged-mirror ray box with lenses
Designed for parallel gravity filtration
revealing cornea
and zinc supports density and specific-heat work
3/4" Plastic Marbles, 5-Pack Lab Supplies_Classroom 75-inch aluminum-and-steel frame for mass-comparisonFive pack of 3 4 inch plastic marbles, providing lightweight projectiles for collision and ramp experiments where steel or glass would carry too much momentum or break on impact.