Triode Valve Mounted Lab Equipment and Supplies_Plastic Labware this low-current 2mA buzzer on

this low-current 2mA buzzer on a demonstration base sounds whenever current flows through the closed circuit

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

Tabletop analog DC ammeter measuring 0-1A at 0

the Alnico composition resisting demagnetization for repeatable field-mapping experiments

Pack of 100 microhematocrit capillary tubes measures 100mm with 1

Triode Valve Mounted Lab Equipment and Supplies_Plastic Labware this low-current 2mA buzzer onMounted on transparent base, with 4 mm colour coded sockets. Mounted on transparent base, with 4 mm colour coded sockets, with circuit diagram printed for demonstration.