Árammérő műszer modell

For demonstrating the force of a magnetic field acting
on a current-carrying moving coil i.e. the principle of a
moving coil measuring device, two 4-mm plug pins
allow it to be plugged into a PIBD with ball bearing
(DE920-2C), includes two permanently attached leads
with 4-mm plugs for providing power,
coil diameter: 90 mm