Reed Relay Demonstration Board Subcategory_Entomology Supplies Greatly magnified transverse dicot stem

Greatly magnified transverse dicot stem model on a mounted base exposes vascular bundle arrangement and primary tissue layers for advanced botany teaching

5cm and field strength from 100 to 7500 Gauss across the working volume

visible crankshaft

12 VDC converter for accessory battery

sized as bulb-spares for three-cell battery packs and ray-box optics work in physics labs

Reed Relay Demonstration Board Subcategory_Entomology Supplies Greatly magnified transverse dicot stemDemonstrates electromagnetic switching on a base with 4mm plug connections, where current through a coil closes a separate contact and shows how a small signal controls a larger circuit.