Thermal Conductivity Star Chemistry Economical minute timer setting intervals

Economical minute timer setting intervals up to one hour via a top knob

Five-piece giant wooden clothespin set sized at 7

5% ±2 digit accuracy on a 3-1/2 digit LCD

Demonstrates that charge resides only on the outer surface of a conductor by inverting the charged net inside out and showing the charge transferring to the new outside layer

with thumb-wheel jaw movement for fine dimensional precision

Thermal Conductivity Star Chemistry Economical minute timer setting intervalsFour metal conductivity star with copper, brass, aluminum, and iron rods radiating from a central heated disc, letting students see conduction rate differences in one view.