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.
Fingerprint Identification Kit
3 Review
Density Cubes Metals 20Mm Sides
6Pcs Lime2018 Parallel Battery Holder
π§ͺ Academic Education: Molecular Inorganic Chemistry
Anatomical Chart of Spinal Nerves and Dermatomes
KISSTAKER Removable Heart Visceral Educational Parts
π Musculoskeletal Anatomy Chart by Palace Learning
𦴠Explore the Intricacies of Human Skeleton with the Movable Skeleton Anatomy Model