Hydra Anatomical Model, Basic Graduations_Ungraduated sized for hands-on Ohm's-law measurement

sized for hands-on Ohm's-law measurement and series-parallel comparison without rewiring between values

5-inch wooden base with a detachable design for easy draining

Life-size median section through a human head at 12 inches reveals cranial cavity

Used as the positive-rail counterpart to the long black lead

Wider 70 x 20 x 8mm cross-section on this Alnico bar pair gives a broader pole face than typical bar magnets

Hydra Anatomical Model, Basic Graduations_Ungraduated sized for hands-on Ohm's-law measurementBasic Hydra model demonstrates freshwater polyp anatomy, tentacles, and simple cnidarian body plan for invertebrate biology teaching.