20m Fiberglass Tape Measure with PVC Cover and Winding Handle Type_Tall Form The wavelength can be changed

The wavelength can be changed with the help of variation in frequency & stress generated using different weights on the one end of rope/thread

Sodium chloride lattice kit with 27 color-coded gray and green atoms plus 54 connectors for building the full cubic NaCl crystal structure in three dimensions

Jumbo three-dimensional frog dissection model with keycard demonstrates amphibian anatomy and organ systems for detailed vertebrate teaching

Polished non-warping wooden base with a built-in meter-scale carries a compass-box magnetometer

Molded black plastic replacement knob sized for the goggle sanitizer cabinet timer switch

20m Fiberglass Tape Measure with PVC Cover and Winding Handle Type_Tall Form The wavelength can be changedFor field surveys, outdoor physics activities, and long distance laboratory exercises, this twenty meter fiberglass tape measure carries a non conductive waterproof PVC coating.