20m Fiberglass Tape Measure with PVC Cover and Winding Handle Type_Tall Form High grade

High grade

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

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

75-inch metal bell in a plastic shroud

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