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The sturdily constructed magnet probe with its freely rotating bar magnet can rotate in the x-axis, y-axis, and z-axis, allowing students to map 3-dimensional magnetic force fields.

Plastic handle with stationary plastic oval ring, rotating oval ring, and rotating magnet bar Total Length: 4.75in Total length of larger stationary circle: 1.75in Bar magnet painted blue on one pole and red on the other pole Magnet rotates freely in x-axis, y-axis, and z-axis (3 dimensions)