Ferromaster & Fluxmaster

Professional handheld instruments from Stefan Mayer Instruments for magnetic permeability and magnetic field measurement — trusted in research, industrial quality control, and field applications across North America.

Stefan Mayer Handheld Instruments

Stefan Mayer Instruments complements its fluxgate sensor range with two purpose-built handheld instruments: the Ferromaster for magnetic permeability measurement and the Fluxmaster for high-resolution magnetic field measurement. Both are designed for ease of use in the field, in the lab, and on the production floor — delivering laboratory-grade accuracy in portable, battery-powered packages.

Ferromaster — Handheld Magnetic Permeability Meter

Overview

The Ferromaster is a compact, handheld instrument that provides fast and reliable measurement of magnetic permeability ($$ \mu_r $$) of raw materials and finished parts. Designed for non-destructive testing, it is widely used in quality control of stainless steels, material selection for electron- and ion-physics apparatus, nuclear resonance equipment, and detection of material changes in highly stressed components.

The instrument is calibrated to reference standards of the National Physical Laboratory (NPL, United Kingdom) and is supplied with a traceable calibration sample. Its measurements conform to international standards ASTM A342 (Test Method 4) and EN 60404-15 (Procedure 6) for testing of weakly magnetic materials, making it suitable for regulated quality-assurance environments.

Operation is straightforward: place the probe tip against the material under test and read the relative permeability directly from the digital display. No sample preparation is required, and results are available in seconds — ideal for incoming goods inspection, production-line checks, and field surveys.

Key Specifications

Parameter	Specification
Measurement type	Relative magnetic permeability ($$ \mu_r $$)
Measurement range	$$ \mu_r = 1.001 $$ to $$ 1.999 $$
Display	Digital LCD, direct readout of $$ \mu_r $$
Calibration	NPL (UK) reference standards; calibration sample included
Standards compliance	ASTM A342 (Test Method 4), EN 60404-15 (Procedure 6)
Probe	Integrated contact probe — place against material surface
Form factor	Handheld, battery-powered
Typical applications	Stainless steel QC, non-destructive material testing, incoming goods inspection, field surveys

Fluxmaster — Handheld Magnetic Field Meter

Overview

The Fluxmaster is a precision handheld magnetometer from Stefan Mayer Instruments, delivering high-resolution magnetic field measurements in a portable, self-contained unit. With 1 nT resolution across three selectable ranges and an offset of less than 5 nT, it offers bench-top performance in a field-ready form factor.

A standout feature of the Fluxmaster is its built-in ambient field cancellation capability. The instrument can null the Earth's magnetic field and other background sources, allowing the user to isolate and measure only the field of interest — a critical advantage when working in magnetically noisy environments such as laboratories, manufacturing facilities, or outdoor survey sites.

The Fluxmaster provides an analog output for seamless integration with data acquisition systems, chart recorders, or oscilloscopes. Its straightforward push-button interface and clear digital display allow operators to begin taking measurements with minimal training. Applications include magnetic field mapping, stray-field detection, magnet characterization, and environmental monitoring.

Key Specifications

Parameter	Specification
Measurement type	DC and low-frequency magnetic field
Resolution	1 nT
Measurement ranges	3 selectable ranges
Offset	< 5 nT
Ambient field cancellation	Built-in — nulls Earth's field and background sources
Analog output	Yes — for DAQ, chart recorder, or oscilloscope integration
Display	Digital LCD
Form factor	Handheld, battery-powered
Typical applications	Field mapping, stray-field detection, magnet characterization, environmental monitoring