Hair Hygrometer, 105mm Diameter Lab Supplies_Filtering Supplies Wide sound-radiating surface on this

Wide sound-radiating surface on this lightweight tuning fork lets it stand upright on its own footprint

and ring magnets with plotting compasses

Demonstrates electromagnetic induction and Faraday's law by stepping DC input into 25mm high-voltage sparks across adjustable electrode rods on an open chassis

sized to read mid-stack battery voltages between the 5V and 15V meters in the line

Proves horizontal velocity does not affect vertical fall time through a push-button launcher that simultaneously projects one steel ball and releases another

Hair Hygrometer, 105mm Diameter Lab Supplies_Filtering Supplies Wide sound-radiating surface on thisMetal cased hair hygrometer on a 105 mm dial reading 0 to 100 percent relative humidity in 1 percent divisions through hair fiber response, running battery free for direct room condition reads.