Magnet permeability meter FerroPro compact (2025)

Convenient and robust instrument for measuring the relative magnetic permeability µr between 1 and 5

Paramagnetic materials up to permeability µr=5

The List-Magnetik Magnet Permeability Meter FerroPro compact can be used to determine the relative magnetic permeability µr of materials and components in the range between 1.000 and 5.000.

Low magnetism - permeability and remanence

Magnetic permeability is an indication of how strongly a material can be magnetized. The statement is useful where no magnetism is actually desired, for example with stainless steel.
Magnetic permeability should not be confused with remanence or residual magnetism: Remanence indicates how strongly an object is actually magnetized, while permeability indicates how easily it could be magnetized, i.e. its ability to adapt to a magnetic field.
The permeability μ is the ratio of the magnetic flux density B to the magnetic field strength H.
The relative permeability µr is the quotient of µ and the magnetic field constant μ0.

Why do you need permeability measurement ?

Applications include quality control of stainless steels, non-destructive testing of structural components, material selection for electron/ion physics and nuclear magnetic resonance equipment, and detection of material changes in highly stressed parts.

Calibration standard - an important accessory for the magnet permeability meter

You can check the accuracy of the measurement at any time using the calibration standard supplied with the device. The standard calibration standard has a value of µr ~ 1.35. Additional calibration standards with reference values of µr ~ 1.03 and µr ~1.11 are available.
The instrument is calibrated against precisely calibrated reference standards traceable to the Physikalisch-Technische Bundesanstalt PTB (Braunschweig, Germany). Recalibration is easily possible. A calibration standard is supplied with each instrument. The magnetic permeability of a material is usually strongly dependent on the strength and frequency of the magnetizing field. The probe of the FerroPro compact can be adjusted to different excitation field strengths. FerroPro compact can be used to perform standard-compliant permeability measurements according to ASTM A342 test methods 1 and 4, EN 60404-15 method 6 and VG 95578.

Spot measurement and scan function

FerroPro compact has a graphical LCD touch panel with an innovative user interface and a resolution of 320x480 pixels.
The scan function allows the user to scan the surface of a part and statistically evaluate the data. The additional analog display complements the visualization of measured values, allowing you to see trends and peaks even out of the corner of your eye.

Scan Measurement	Data logger and Application
Do you want to continuously scan a workpiece and determine the minimum and maximum values? The scan measurement provides you with a graphical permeability curve with statistical evaluation.	Do you need to generate a report of the permeability measurement? With the Lima Connect app you can read out the device memory and process and send the data.

Interfaces and operation

With flexible data logger, combined digital and analog display, and peak value measurement, the instrument supports all areas of permeability measurement. The wireless interface can be used to transfer data to a Windows PC as well as to the Android or iOS app. The USB interface allows the device to be connected to an external power source for continuous operation.
An SCPI interface is implemented, allowing the instrument to perform remote measurements in line operation and to provide measured values. Connection is via USB, which also provides power and continuous operation.

Limits of accuracy in permeability measurement

The measured value of permeability depends on the dimensions of small material samples. The sensitivity of the device increases with the thickness of the material.
From a thickness of about 5 mm and a lateral expansion of about 2 cm, the measurement is independent of the size.
The approximate dependence of the sensitivity on the thickness is shown in the diagram.
The sensitivity is calculated as (µr displayed - 1) / (µr true - 1)

Measuring ranges of permeability meters – Paramagnetism

Magnetic materials can be classified according to their permeability number.
Diamagnetic materials 0 < µr < 1
Paramagnetic materials μr > 1
Ferromagnetic materials μr ≫ 1
Measurements with List-Magnetik permeability meters can only be carried out on paramagnetic materials. For example, aluminum, chromium, platinum and stainless steel are paramagnetic. For stainless steel, the value µr depends on the alloy.
Ferromagnetic materials (iron, nickel, cobalt and various alloys) have a permeability number that is significantly greater than 1 and can assume values of more than 100. Such materials considerably increase the magnetic flux density of a magnetic field. List-Magnetik permeability measuring devices are not designed for this.

A short video tutorial on the use of the device

Manage and send measurement data with a free application

To further process your measurement data, you can pair your measuring device with mobile Android and iOS devices. Or you communicate with a Windows PC. This is made possible by wireless technology. With the Lima Connect app you can manage projects and assign the measuring points on a photo. The measurement results can be statistically evaluated and displayed graphically. The app for Android, iOS and Windows is free.

Models and scope of delivery Magnet permeability meter FerroPro compact

FerroPro compact
with measuring probe FPC-5, calibration standard (~1.35), probe cable and case, including calibration certificate

Measuring instruments by List-Magnetik - Made in Germany - Quality and durability