Premium Demonstration Dynamo with Hand Driver Type_Round End packaged with a keeper that

packaged with a keeper that bridges the poles to keep the field intact between sessions

All-glass water still producing distilled water for laboratory use through a contamination-free path that eliminates metallic leaching from internal surfaces

and studying bacteria

and tin cylinders for matched-volume mass and density studies

and strike-slip faults with clearly distinguished hanging-wall and footwall blocks for structural-geology lessons

Premium Demonstration Dynamo with Hand Driver Type_Round End packaged with a keeper thatHand driven dynamo on an 8x5 inch base with a 125mm pulley belt coupled to the dynamo and 4mm output sockets, with an LED indicator and reversible operation as a 6 8V DC motor.