Real Coal Specimen with Cotton Bag, Large Lump Included_Rod & Base this galvanic skin response data-logging

this galvanic skin response data-logging sensor tracks changes in skin conductivity tied to emotional and physiological states

Seventeen-and-a-half-inch wooden simple-lever apparatus with an adjustable fulcrum on an 8

Rod-mounted plastic ball-bearing pulley with a 50mm wheel on a 150 by 10mm rod

Heavy-duty metal inspection quadrat divided into 25 equal squares

Real Coal Specimen with Cotton Bag, Large Lump Included_Rod & Base this galvanic skin response data-loggingPart novelty gift and part geology specimen, this single large lump of genuine American coal ships in a cotton drawstring bag with a linked science experiment activity.