Classroom Collection of Rocks & Minerals PS Waves and their Applications in Technologies for Information Transfer Built-in re-magnetizing zone: Embedded neodymium

Built-in re-magnetizing zone: Embedded neodymium magnets restore compass accuracy quickly and easily

There's no motor and nothing to calibrate

marked at every foot

that glow resolves into dozens of distinct emission lines spread across the visible range

and maybe even a few unforgettable hairstyles

Classroom Collection of Rocks & Minerals PS Waves and their Applications in Technologies for Information Transfer Built-in re-magnetizing zone: Embedded neodymiumDesigned for general classroom use, the kit includes specimens in the following groups: igneous, sedimentary and metamorphic rocks, ores, gemstones and minerals in the scale of hardness. Contains 49 number coded specimens (talc not included), approximately 1 x 1.