The grids we had had the wrong number of lines per inch. This is easy to understand once you know the wavelength, but it can be confusing for beginners. This still works for the demo.
Density Cubes Metals 20Mm Sides
3 Review
π Density Cube Block for Specimen Analysis
π Cylindrical Metal Length and Diameter
π¬ Precision Density Cube Set - Metals with 10mm Sides
π Laminated Anatomical Pack for Skeleton Ligaments
Heart Anatomy Poster Laminated Anatomical
π§ Enhancing Anatomy Learning: Portable & Detachable Enlarged Anatomical Education Aid for Students
KISSTAKER Removable Heart Visceral Educational Parts