Concept:
Magnetic flux (\( \Phi \)) measures the total magnetic field passing through a surface.
It is defined as:
\[
\Phi = B \cdot A
\]
where:
\( B \) = magnetic field (Tesla)
\( A \) = area (m\(^2\))
Step 1: SI unit calculation
\[
\text{Magnetic flux unit} = \text{Tesla} \times \text{m}^2
\]
This unit is called the Weber (Wb).
Final Answer:
\[
\boxed{\text{Weber (Wb)}}
\]