Opisometer Geology sized to read one step

sized to read one step up from the 0-1A meter when student circuits draw past the lower meter's full-scale deflection

Single large transparent plate filled with iron-rod plotting compasses

and field magnet for direct observation as students trace how current produces rotation in a closed magnetic circuit

Polished hardwood test tube rack with a traditional two-tier design

Relay-based NAND-gate module on a demonstration base

Opisometer Geology sized to read one stepOpisometer with a knurled wheel on a threaded spindle, rolling along curved lines on maps, charts, and drawings to convert winding distance into straight line length for geography coursework.