Magnetic Compass
For tracing the magnetic elds of bar magnets. 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 |
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