Rocks and Volcanoes Teaching Model Subcategory_Stopwatches and Timers Higher-impedance single-decade resistance box stepping

Higher-impedance single-decade resistance box stepping from 10k to 100k ohms in 10k-ohm increments

Mass-calibrated copper block calorimeter at 1kg adjusted within +2%

Bulk 144-pack of pre-cleaned 75 x 25mm glass microscope slides features frosted labeling ends and ground polished edges for high-volume teaching labs

Triple tandem plastic pulley with 25/38/50mm ball-bearing wheels on an open-sided 17

Rocks and Volcanoes Teaching Model Subcategory_Stopwatches and Timers Higher-impedance single-decade resistance box steppingDepicts sedimentary, igneous, and metamorphic rocks alongside volcanic structures on a wall mountable labeled backboard, serving as a rock cycle and volcanism reference.