Steel Tuning Fork Pair with Wood Bases, 440Hz (One Adjustable) Subject_Botany these concavity microscope slides hold

these concavity microscope slides hold liquid samples for hanging-drop preparations and observation of specimens in suspension

5-inch compact and 6-inch long-format units

and a dual-scale screen

Hand-painted 4-part human brain model separates into cortical hemispheres and brain-stem regions for lobed-anatomy teaching at introductory biology levels

suited to fieldwork in geography units and orientation activities outside the classroom

Steel Tuning Fork Pair with Wood Bases, 440Hz (One Adjustable) Subject_Botany these concavity microscope slides holdAdjustable mass on one fork shifts its 440Hz pitch by a few hertz, producing audible beats when sounded against its fixed frequency partner on the matching wooden resonance base.