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ROHMANN Eddy Current Test Instruments and Systems
This innovation has come full circle in a historic sense.
The Rohmann success story started in 1977 with the hand-held rototest and is now continuing with the new elotest m6. The digital single hand test instrument stands out due to the excellent quality of its signals. The new hand-held elotest m6 makes an impression thanks to an integrated C-Scan function for array probes and rotor applications. It is the first hand-held device, which provides an analysis of the harmonic wave for testing metallic materials for changes in the microstructure, hardness and strength.


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Multiplex of 256 sensors max., for example with the latest array technology and with an external Mini-Mux integrated in the sensor. C-Scan display for array probes and rotor applications.


The device is dustproof and to a limited extent waterproof. It has the corresponding IP protection class so that it can be temporarily immersed in water to a maximum depth of 1 meter for a maximum of 30 mins.


Total weight of the test instrument, including a powerful, quickly replaceable battery with up to 8 h service life. A replacement battery can be comfortably carried in a belt pack.


Touch display – can be operated intuitively, even when wearing work gloves. An test instrument that does not require any keys. User-friendly software. Can be directed vertically or horizontally for flexible applications.


Harmonic analysis for testing microstructure and material properties. Flexible marking of the signal test timeline. Recording of audio comments and text memos.


Sensor-Bus „Rohmann Accessory Bus“ für die Anbindung von intelligenten Sensoren, Rotoren und Array-Sonden. Wechselbarer Sonden-Adapter für die Verwendung von Fremdsonden.

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Do you have any questions?

Frequently asked questions

What is eddy current testing?

Eddy current testing can be used to check objects made of electrically conductive materials for integrity, composition and tempering condition or also for geometric dimensions. Eddy current testing is based on the physics of electromagnetic fields.

How is eddy current generated?

A current-carrying electrical conductor is surrounded by a circular magnetic field (vortex field). If the straight conductor wire is now wound into a circular conductor loop, the vortex-like field lines overlap in such a way that they form a magnetic dipole (with a north/south pole structure).

What does penetration depth mean?

In principle, eddy current testing can be classified as a surface testing method. Depending on the method, the induced eddy currents are concentrated on a more or less thin layer close to the surface. The strongest eddy currents flow directly at the surface. Therefore, the maximum test sensitivity can be achieved there.

What are probes?

The art of probes development consists in the realisation of a sensor construction that brings the required magnetic field (and thus the eddy current field) to the ‚test location‘ in the workpiece with the required test frequency, in the optimum alignment and required strength, while always minimising undesirable effects as far as possible.

Which probes are used?

Basically, there are two main groups of probes: flow sensors and tactile probes. In the case of through-flow probes, a distinction is made between: External pass-through sensor, which encloses the test object and is guided through it (e.g. rod testing with comprehensive test coils) and internal pass-through sensor, which is enclosed by the test object, i.e. the sensor is guided through the test object (e.g. in internal pipe testing). Pass-through sensors always detect a complete circumferential section of the test object, outside or inside.

What test frequency is needed?

When selecting the test frequency for eddy current testing, consider the specific requirements of the application and the sensor to be used. The recommended frequency range for the sensor should be taken from the manufacturer’s sensor data sheet.

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