Mason's Hygrometer with Wet and Dry Bulb, Wall-Mounted Racks & Stands_Test Tube Racks Compact-format sonometer designed to study

Compact-format sonometer designed to study the physics of vibrating strings on a footprint smaller than the standard 1-meter teaching unit

this Wimshurst generator builds a visible high-voltage spark

sized for compass-deflection and small-scale field-line investigations

Push switch on a demonstration base with 4mm plug connections

Mason's Hygrometer with Wet and Dry Bulb, Wall-Mounted Racks & Stands_Test Tube Racks Compact-format sonometer designed to studyWall 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.