It's not that simple. you may not know exactly what strength means in terms of magnetic properties.

Units used in magnet strength measurements.

Tesla : density of an magnetic field, flux density. T = kg / (A * s2)

A = amperes and s = seconds.

My favorite:

T = V * s / m2 or T = (N * s)/(C * m) or T = Wb / m2.

where V = volts, s = seconds, m = meters, N = newtons, C = coulombs and Wb = webers.

You want to measure a magnetic field in a coil. How about after you turn the power off and there's no magnetic field.

Gauss: is used to measure the remnants of the magnetic field (magnetic flux density).

One gauss is equal to 10-4 teslas. It can also be defined as 1 maxwell per square centimeter or 10-4 webers per square meter.

Then there is Oersted & Kilogram.

The latter being the force required to pull a magnet away from the flat metal surface that it is making full surface-to-surface contact.

Oersteds, is the force required to reduce a magnet's magnetic characteristics to zero.

A magnetometer, or gaussmeter, is used for measuring a magnetic field.

Wasn't that simple?

*Hall effect* Magnetometers that use the Hall effect use current to ascertain whether a magnetic field is nearby and how strong it is.

**Magnetoinduction effects**: Magnetometers that rely on magnet induction calculate how magnetized a certain material becomes when exposed to a magnetic field.

**Magnetoresistance effects**: Magnetometers that use magnetoresistance calculate an object's ability to change its electrical resistance when it becomes exposed to a magnetic field.