# What do these values mean in a magnetic field meter?

This is not a real-life field meter. The below image with 4 values in the field meter is from a simulation. I wanted to know what these values mean, especially the first 2. Can you please help me?

I imagine that they are the magnitude and $$x$$ and $$y$$ components of the $${\bf B}$$ field measured in gauss. If the device is to measure the Earths magnetc field (which is a few gauss) the $$\theta$$ is probably the dip angle. The $$x$$ axis would thebe oriented to true north.
• @CoolBean $B_x$ and $B_y$ are the $x$ and $y$ components of the magnetic field at that point, i.e. if you resolve your vectors into components along $x$ and $y$ axis, these would be those components. On vector addition, they would result in the same vector. Sep 8, 2021 at 11:51
The meter seems to show the magnetic field intensity at the point of interest. The magnetic field intensity, in this case, has been measured in units of gauss ($$1 G = 10^{-4} T$$). The angle $$\theta$$ is the angle between the $$x$$-axis and the magnetic field. $$B_x$$ and $$B_y$$ are the $$x$$ and $$y$$ components of the magnetic field. Since the angle $$\theta$$ is zero, the $$x$$-component $$B_x = B \cos\theta = B$$ and the $$y$$-component $$B_y = B \sin\theta = 0$$