For tracing the magnetic fields of bar magnet. Consists of a magnetic needle encased in cylindrical aluminium case with glass top. Card dial.
Diameter | Cat.No. |
16mm | 3121-01 |
25mm | 3121-02 |
37mm | 3121-03 |
50mm | 3121-04 |
75mm | 3121-05 |
100mm | 3121-06 |