Magnet Myths and Misconceptions

[synchro1]

It isn't.

Strength of a magnetic field is measured in Tesla units or Gauss.

[verpies]

"Pull-force on a test piece of iron is not the same thing as the strength of the magnetic field".

It is true. A linear "pull force" on a piece of iron depends on the gradient of magnetic flux density, and a torque acting on a magnetic dipole (e.g. a bar magnet)  depends on magnetic flux density and the sine of the angle that the dipole forms with the B field's direction.

This is nothing but complete bullshit. All magnetometers work on the principle of attraction to magnetic objects

No, for example the Hall sensor works on the principle of Lorentz deflection of electric charges.  The Hall sensor is sensitive to the magnetic flux density and the angle to the B field, unlike iron which is linearly sensitive only to the flux density gradient. 
Because of this difference it is possible for a Hall sensor to give a very high reading while a piece of iron placed in the same location will not experience any linear attraction force.

[verpies]

Strength of a magnetic field is measured in Tesla units or Gauss.

Actually those are units of magnetic flux density. (a.k.a. "B field")
It is possible for a piece of iron to experience zero linear force in a high magnetic flux density, because the iron reacts linearly only to its gradient.

[synchro1]

It is true. A linear "pull force" on a piece of iron depends on the gradient of magnetic flux density, and a torque acting on a magnetic dipole (e.g. a bar magnet)  depends on magnetic flux density and the sine of the angle that the dipole forms with the B field's direction.
No, for example the Hall sensor works on the principle of Lorentz deflection of electric charges.  The Hall sensor is sensitive to the magnetic flux density and the angle to the B field, unlike iron which is linearly sensitive only to the flux density gradient. 
Because of this difference it is possible for a Hall sensor to give a very high reading while a piece of iron placed in the same location will not experience any linear attraction force.

@Verpies,

The Hall effect sensor simply produces a voltage proportional to the applied magnetic field. The strength of the magnetc field is measured in gauss: "The gauss, abbreviated as G or Gs, is the cgs unit of measurement of a magnetic field B, which is also known as the "magnetic flux density" or the "magnetic induction".

"The most common magnetic sensing devices are solid-state Hall effect sensors. These sensors produce a voltage proportional to the applied magnetic field and also sense polarity".

One gauss is also equal to 10−4 kg C−1 s−1. Notice the Kg value in the gauss equation. This represents "Kilograms of pull force".
This value alone is the sole value of magnetic field strength.

Hall effect sensor voltage is directly proportional to the "pull force" of the applied magnetic field.

[MileHigh]

Synchro1:

MarkE, Verpies, and myself are correct and you are wrong.  I am sure that Picowatt would join our club also.  What I suggest you do is look over what has been stated and do some searching on those terms and find the information and learn it.  If there are people that are interested in magnetism and the terms "magnetic flux," "magnetic flux density," and especially the term "magnetic field gradient" make you just "zone out" and just skip it, you can't.  Just do the work and hopefully come back better informed.

MileHigh