6-Piece Premium Rock Specimen Set Subcategory_Racks and Stands Chrome-plated 50mm reading magnifier with

Chrome-plated 50mm reading magnifier with a 10cm focal length

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Wall-mounted Mason's hygrometer with two identical dual-scale thermometers — one dry and one kept wet via a water reservoir — calculating relative humidity from their paired reading difference

000 lux through a separate probe with a CIE photopic spectral response

Used to set a tuning fork ringing without bruising its tines

6-Piece Premium Rock Specimen Set Subcategory_Racks and Stands Chrome-plated 50mm reading magnifier withSix hand picked rock specimens showcase varied igneous, metamorphic, and sedimentary textures for focused introductory geology lessons.