6-Piece Premium Rock Specimen Set Subcategory_Racks and Stands Wall-mounted Mason's hygrometer with two

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

Large-wheel pulley mounted on a universal clamp for attachment to retort rods or support stands

supplied with two 5-inch insulated-handle pointer electrodes

sized so that students can charge an outer pail and watch the inner pails register zero charge during the classic ice-pail demonstration

this digital laboratory timer provides accurate countdown and count-up readouts in classroom and stockroom settings

6-Piece Premium Rock Specimen Set Subcategory_Racks and Stands Wall-mounted Mason's hygrometer with twoSix hand picked rock specimens showcase varied igneous, metamorphic, and sedimentary textures for focused introductory geology lessons.