Gmw Associates
GMW Associates is a U.S.-based, 100% employee-owned distributor and integrator (founded 1982) of precision magnetic field and electric current measurement instruments, NMR teslameters, fluxgate magnetometers, custom electromagnets, and accredited calibration services, serving particle accelerator, MRI, EV/power electronics, defense, and research customers globally from its San Carlos, California headquarters.
- Company typePrivate
- Founded1982
- HeadquartersSan Carlos, United States
- Headcount11–50
- GTM typeB2B
- OfferingHardware or Manufacturing
What Gmw Associates does
GMW Associates is a privately held, 100% employee-owned U.S. supplier founded in 1982 and headquartered in San Carlos, California, specializing in precision magnetic field and electric current measurement instrumentation and custom electromagnet systems. The company operates as both a value-added distributor of complementary third-party product lines (Metrolab NMR teslameters and HallinSight cameras, Bartington fluxgate magnetometers, Danisense zero-flux current transducers, PEM Rogowski coil probes, Bergoz non-destructive beam diagnostics, Senis and AKM Hall sensors, HTS-110 current leads) and a manufacturer of its own GMW-branded electromagnets (dipole, Helmholtz, projected-field, and custom configurations producing fields to >5T). Underlying technology centers on four measurement modalities — fluxgate magnetometry (noise <6pT/√Hz at 1Hz), NMR teslametry (<10 ppb precision at 3T, treated as a world standard), Hall-effect sensing, and zero-flux current transduction (<10 ppm accuracy) — supported by an A2LA-accredited (ISO/IEC 17025:2017, Certificate 4349.01) calibration laboratory.
The company makes money predominantly through quote-based hardware sales to research, industrial, and government customers, supplemented by recurring NIST-traceable and ISO/IEC 17025 accredited calibration services. Pricing is not publicly disclosed; standard products require direct sales engagement, while a small set of clearance items is sold at fixed prices through eBay. Go-to-market is direct-to-customer, supported by dedicated application engineers for each product family and a heavy conference presence (IEEE APEC, ISMRM, APS March Meeting, Intermag, ECCE, NAPAC, Battery Show / EV Tech Expo, AGU).
GMW serves a horizontally diversified base of more than ten end-markets — particle accelerators, MRI OEMs and research sites, EV/power electronics/motor drives, oil & gas and geophysics, aerospace and space, materials research and spintronics, metrology, and security and defense — with particle accelerators, MRI, and EV/power electronics identified as primary segments. Notable end users and partners include MRI system manufacturers, the US Air Force Research Lab (via SemiProbe integration), and Celadon Systems for wafer-level magnetic testing. The firm has roughly 20 employees, has been at its current San Carlos facility since 1991 (expanded three times to 13,000 sq. ft.), and reports no external institutional ownership, no subsidiaries, and no M&A activity.
Gmw Associates firmographics
Firmographics- Name
- Gmw Associates
- Legal name
- GMW Associates
- Website
- https://gmw.com
- Company type
- Private
- Founded year
- 1982
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- GMW Associates is a U.S.-based, 100% employee-owned distributor and integrator (founded 1982) of precision magnetic field and electric current measurement instruments, NMR teslameters, fluxgate magnetometers, custom electromagnets, and accredited calibration services, serving particle accelerator, MRI, EV/power electronics, defense, and research customers globally from its San Carlos, California headquarters.
- Ownership category
- akta.pro rank
Gmw Associates industry classification
Industry- Product category
- Precision Magnetic and Electrical Measurement Instrumentation
- NAICS
- Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals (334515), Other Measuring and Controlling Device Manufacturing (334519), Navigational, Measuring, Electromedical, and Control Instruments Manufacturing (3345), Analytical Laboratory Instrument Manufacturing (334516)
- SIC
- Instruments For Meas & Testing Of Electricity & Elec Signals (3825), Industrial Instruments For Measurement, Display, And Control (3823), Electronic Coils, Transformers & Other Inductors (3677)
- akta.pro primary industry
- Industrial-Grade Sensors & Transducer Components (Discrete sensing elements, transducers, MEMS sensors) (IMAGAJAO)
- akta.pro secondary industries
- Magnetic Sensors (Hall/Magnetoresistive/Compass) (HDAHALAC), Calibration Services & Standards (Calibration labs, reference standards, traceability services) (IMAGAFAH), Transformers & Magnetics (Power/Signal) (HDAHANAD), Test, Measurement & Calibration Equipment Manufacturing Services (ATE, DAQ, metrology electronics) (IMAGAGAH)
Keywords
Where Gmw Associates is headquartered
LocationHeadquarters
- HQ city
- San Carlos
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Gmw Associates business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure
Revenue model
- Magnetic Measurement Instruments: Sale of magnetic field measurement instruments including fluxgate magnetometers, NMR teslameters, Hall-effect sensors, and magnetic field mapping systems. Products range from portable instruments to precision laboratory equipment.
- Electric Current Measurement Products: Sale of current transducers, Rogowski coil probes, clamp-on and clip-on current probes, and current transformers for DC and AC measurement applications
- Electromagnets and Coils: Design, manufacture and sale of copper electromagnets with fields over 5T, including dipole electromagnets, Helmholtz coils, projected field magnets, and custom magnet systems
- Calibration Services: AC and DC current transducer calibration services and magnetic field measurement equipment calibration. Includes NIST traceable and ISO/IEC 17025:2005 accredited calibration at San Carlos, CA location
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| One time/ perpetual license | Pay-as-you-go | Clearance/Discontinued Items |
Go-to-market motion1 record
Distribution channels1 record
Marketing channels3 records
Gmw Associates product offering
Product offeringCore offering
GMW Associates manufactures and distributes precision magnetic field and electric current measurement instrumentation, including electromagnet systems, NMR teslameters, fluxgate magnetometers, Hall-effect sensors, magnetic field mapping systems, and current transducers. The company also operates an ISO/IEC 17025-accredited calibration laboratory providing AC/DC current transducer and magnetic field measurement equipment calibration services.
Product overview
GMW Associates is a distributor and integrator of sensors, transducers, and test & measurement instrumentation specializing in magnetic and electrical measurement. The product portfolio centers on magnetic field measurement instruments (Hall sensors, fluxgate magnetometers, NMR teslameters, magnetic field cameras), electric current measurement devices (flux-gate transducers, Rogowski coils, clamp-on probes), and electromagnets (projected field, dipole, and Helmholtz coil systems). Key product lines include Metrolab NMR teslameters and magnetic field cameras, Bartington fluxgate magnetometers, Danisense current transducers, PEM Rogowski coil probes, and GMW's own electromagnets. The company also offers calibration services and represents multiple manufacturer brands. Products serve industries including particle accelerators, MRI, power electronics, electric vehicles, geophysics, and materials research.
Differentiator
Problem solved
Functional benefit
Products and services
- GMW Electromagnets Series (5200, 5400, 5500) Wide array of copper electromagnets with fields over 5T, including projected field, dipole, and Helmholtz coil configurations for DC and AC operation. Used by research labs, MRI manufacturers, and particle accelerator facilities.
- GMW Model 3460 Dipole Electromagnet Compact, lightweight (<10kg) dipole electromagnet for table-top experimentation with fields over 1.5T, fast cycle times, and any mounting orientation. For research and laboratory use.
- GMW 5454 Miniature Helmholtz Coil Miniature Helmholtz coil with precision coil adjustment for fine alignment, lightweight at 1.25kg, for physics experimentation and calibration applications.
- Metrolab PT2026 NMR Teslameter Nuclear Magnetic Resonance teslameter with extended range of 38 mT to 30 T, ultra-high precision below 10 ppb at 3T. Used as the world standard for precision NMR measurements in scientific and industrial applications.
- Bartington Fluxgate Magnetometers 3-axis fluxgate magnetometers with ranges from 70 to 1000 µT, output of 10V full scale, bandwidth DC to 3kHz, noise below 6pT/√Hz at 1Hz for low-field precision applications.
- Metrolab MagVector MV2 Digital 3-axis Hall Magnetic Sensor Digital 3-axis Hall magnetic sensor with selectable measurement ranges from 100 mT to 30 T, low noise at 300 nT/√Hz, analog and digital interfaces, measurement rates up to 3 kHz.
- Senis 3DHALL 3-Axis Hall Magnetic Sensor CMOS integrated magnetic field sensor for acquisition of all 3 magnetic-field components (Bx, By, Bz) with 1D/2D/3D selectable sensitivity axis, 1µT resolution.
- FAMAS Magnetic Angle Sensor SENA2Dx Contactless angle sensor 0-360 degrees using Hall-based principle with patented direct angle-to-digital conversion, handles high magnetic fields over 500 mT.
- Danisense High-Precision Current Transducers Flux-gate zero flux DC/AC current transducers with peak current from 60A to 2000A, approximately 10ppm accuracy, bandwidth from DC-5kHz to DC-1MHz for precision current measurement.
- PEM CWT AC Current Probes Flexible clip-around Rogowski coil AC current probes with bandwidth up to 50MHz, peak current ranges from 30A to 300kA, apertures from 80mm to 1000mm.
- Bergoz NPCT Non-Destructive Current Transformer Non-destructive DC beam current measurement with full scale range from 20mA to 20A, resolution of 0.5 µArms/√Hz, bandwidth DC to 10 kHz. Installed at most of the world's storage rings as calibration instrument.
- Bergoz CR-BCM Re-entrant cavity resonator beam current monitor for particle beam diagnostics with sub-nanoampere resolution of CW beams and macropulses.
- Senis MMS-1A-RS Magnetic Field Mapper High resolution magnetic field mapping system for quality control of permanent magnets and assessment of assemblies such as loudspeakers and multi-pole magnets.
- Metrolab HallinSight 3-D-Hall Magnetic Field Camera Off-the-shelf solution for mapping static magnetic fields with 2.5mm grid measurement, lateral geometric position error below 50 µm.
- Bartington MS3 Magnetic Susceptibility Meter High sensitivity measurements of sample susceptibility for environmental sciences, biology, archaeology, geology, and exploration geophysics applications.
- PPM Point-to-Point Fiber-Optic Links High fidelity analog signal transmission via optical cable with immunity to electrical interference and high voltage isolation, DC-40MHz bandwidth options.
- IECO BPS Bipolar Power Supplies High performance bipolar power supplies with full 4-quadrant output operation, voltage and current modes, very low switching ripple and noise.
- Elemental Instruments Precision Permanent Magnets Tunable permanent magnets for fields up to 0.35 Tesla with homogeneity over 10mm², used in medical imaging, chemical analysis, material science and particle physics.
- HTS-110 Current Leads
Quantifiable outcome
- NMR precision of <10 ppb at 3T for magnetic field measurement
- +2 more outcomes
Companies that use Gmw Associates
Customer profileNamed customers4 records
Segments8 records
Ideal customer profiles6 records
Gmw Associates technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature5 records
Gmw Associates partnerships and signals
Strategic signalPartnerships
Eleven partnerships are on record, tiered core and minor.
- Metrolab TechnologycoreStrategic partnership dating to mid-1980s when GMW got into MRI business. Metrolab develops NMR teslameters and magnetic field cameras. GMW distributes Metrolab products and co-exhibits at industry conferences. Joint solutions for MRI and particle accelerator applications.
- DanisensecoreDanisense produces flux-gate zero flux DC/AC current transducers with <10ppm accuracy. GMW is North American distributor. Jointly exhibits at IEEE APEC and other power electronics conferences. Products used together in precision current measurement applications.
- PEM (Power Electronic Measurements)corePEM manufactures Rogowski coil AC current probes. GMW distributes PEM products in North America. Jointly exhibits at power electronics conferences including IEEE APEC and ECCE.
- Bartington InstrumentscoreBartington produces fluxgate magnetometers and gradiometers. GMW distributes Bartington products including Mag-01 series and Mag-13 series sensors. Long-standing distribution relationship.
- Bergoz InstrumentationcoreBergoz produces particle beam diagnostics including NPCT, FCT, IPCT, and BPM products. GMW distributes Bergoz products for non-destructive beam current measurement and diagnostics.
- SeniscoreSenis manufactures 3-axis Hall magnetic sensors, magnetic field transducers, and current sensors. GMW distributes Senis products including 3MH series teslameters and F3A/F1A transducers.
- AKM (Asahi Kasei)coreAKM (Asahi Kasei Microdevices) produces Hall elements, Hall ICs, and current sensors. GMW distributes AKM products including linear Hall ICs, Hall switches, and Currentier current sensors.
- HTS-110minorHTS-110 produces HTS (High Temperature Superconducting) current leads for cryogenic applications. GMW distributes HTS-110 CryoSaver current leads.
- Celadon SystemsminorPartnership for integrated magnetic testing solutions. Celadon integrates GMW projected field electromagnets into probe systems for semiconductor wafer-level magnetic testing, characterization, and reliability testing.
- SemiProbeminorSemiProbe integrates GMW 5201 and 5203 projected field electromagnets into MSS Probe Systems. Delivered systems to US Air Force Research Lab (AFRL) with shaped pole tips for magnetic testing applications.
- Advanced Magnetics for Power & Energy Development (AMPED) ConsortiumminorIndustry consortium focused on developing innovation ecosystem and educational programs for advancing soft magnetic materials and component technologies from fundamental science to end-use application.
Scale indicators3 records
Recent moves9 records
Expansion highlights5 records
Gmw Associates competitors and assessment
Company assessmentDirect peers
- Lake Shore Cryotronics: Lake Shore Cryotronics manufactures precision magnetic measurement instruments, Hall sensors, and cryogenic thermometry for research and industrial customers - directly comparable portfolio to GMW's fluxgate magnetometers, Hall-effect sensors, and NMR teslameters, with similar end-markets in physics research and quantum/superconductor applications.
- Bartington Instruments: Bartington Instruments manufactures fluxgate magnetometers and gradiometers (Mag-01, Mag-13 series) used in geomagnetic surveys, space, and laboratory applications - GMW is in fact their North American distributor, but Bartington also sells direct in other regions and competes head-to-head on fluxgate specifications (e.g., 6 pT/sqrt(Hz) noise floor).
- Senis AG: Senis AG manufactures 3-axis Hall magnetic sensors, magnetic field transducers, and current sensors (3MH series teslameters, F3A/F1A transducers) - GMW distributes Senis products but Senis also sells directly into the same MRI, semiconductor, and power-electronics customer base.
- Metrolab Technology: Metrolab Technology develops NMR teslameters and magnetic field cameras (PT2026, HallinSight 3-D) used in MRI manufacturing and particle accelerators - GMW co-founded Metrolab and is its strategic partner/distributor, but Metrolab also competes/coordinates in the same scientific instrument market worldwide.
- Group3 Technology: Group3 Technology manufactures precision magnet power supplies and Hall-effect measurement systems used in conjunction with electromagnets in MRI, physics research, and industrial materials testing - directly comparable to GMW's electromagnet systems and IECO BPS bipolar power supply line.
- Cryogenic Limited: Cryogenic Limited manufactures cryogenic and superconducting magnet systems, instrumentation, and bespoke measurement solutions - comparable in serving physics-research and accelerator customers with high-precision magnetic instrumentation and magnet systems.
- Stanford Research Systems: Stanford Research Systems manufactures precision scientific instruments including lock-in amplifiers, spectrum analyzers, and magnet power supplies for laboratory physics and engineering - directly comparable in targeting research-lab customers with high-precision instrumentation, including some magnetic measurement workflows.
- Dexter Magnetic Technologies: Dexter Magnetic Technologies designs and manufactures custom and standard electromagnet systems, permanent magnets, and magnetic assemblies - directly comparable to GMW's electromagnet systems business, with overlap in MRI, industrial, and research applications.
Broad incumbents
- AMETEK: AMETEK is a large diversified electronic instruments and electromechanical devices conglomerate with a Test & Calibration segment that includes precision power and magnetic measurement instrumentation - a broader incumbent that competes across many of the same scientific and industrial niches GMW serves.
Emerging players
- TDK-Lambda: TDK-Lambda manufactures precision programmable DC power supplies and current measurement solutions - overlaps with GMW's magnet power supply offering (e.g., IECO BPS products) and the Danisense current transducer line, particularly for power-electronics and EV test applications.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights7 records
Customer concentration
Gmw Associates social profiles
Digital presenceGmw Associates compliance and trust
Trust signalCompliance2 records
Gmw Associates financial estimates
Financial estimateRevenue estimate
Valuation estimate
Gmw Associates leadership team
Management profileNumber of profiles
Profiles13 records
Gmw Associates funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Gmw Associates M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Gmw Associates
What does Gmw Associates do?
GMW Associates manufactures and distributes precision magnetic field and electric current measurement instrumentation, including electromagnet systems, NMR teslameters, fluxgate magnetometers, Hall-effect sensors, magnetic field mapping systems, and current transducers. The company also operates an ISO/IEC 17025-accredited calibration laboratory providing AC/DC current transducer and magnetic field measurement equipment calibration services.
Is Gmw Associates a public or private company?
Gmw Associates is a private company. It is classified as management employee owned and is currently operating.
When was Gmw Associates founded?
Gmw Associates was founded in 1982. It employs 11 to 50 people.
Where is Gmw Associates based?
Gmw Associates is headquartered in San Carlos, United States, in the North America region.
How does Gmw Associates make money?
Four revenue lines are on record. Magnetic Measurement Instruments are the primary driver. The others are electric Current Measurement Products, electromagnets and Coils and calibration Services.
Who are Gmw Associates's main competitors?
Direct peers on record are Lake Shore Cryotronics, Bartington Instruments, Senis AG, Metrolab Technology, Group3 Technology, Cryogenic Limited, Stanford Research Systems and Dexter Magnetic Technologies. AMETEK is listed as a broad incumbent. TDK-Lambda is listed as an emerging player.
Does Gmw Associates have an API?
No public API is recorded for Gmw Associates.
What industry is Gmw Associates in?
Gmw Associates's product category is Precision Magnetic and Electrical Measurement Instrumentation. Its primary akta.pro industry code is IMAGAJAO, Industrial-Grade Sensors & Transducer Components (Discrete sensing elements, transducers, MEMS sensors), with a secondary code of HDAHALAC, Magnetic Sensors (Hall/Magnetoresistive/Compass). Its NAICS code is 334515 and its SIC code is 3825.