Hair Hygrometer, 105mm Diameter Size_13 Inch Five-pulley set of tandem low-friction

Five-pulley set of tandem low-friction plastic pulleys at 25

Plug-in 120V AC blower sized to feed a linear air track

interference - within reach of an introductory wave-mechanics curriculum

producing more sinusoidal oscillation than a standard helical spring for SHM studies

Nine-model set traces embryonic and fetal development across the full gestational period

Hair Hygrometer, 105mm Diameter Size_13 Inch Five-pulley set of tandem low-frictionMetal 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.