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Everything Eddy Current


SigmaCheck 2

The SigmaCheck 2 Eddy Current (ECT) Conductivity Meter is designed to provide the user with fast and accurate conductivity measurements at a reasonable price; whilst being extremely easy to use making it suitable for use by shop inspectors or engineers.

Meeting the requirements for conductivity measurements in the aircraft manufacture and maintenance, the SigmaCheck 2 is put to work where conductivity measurements are used to verify proper alloy/temper or detect heat damaged components.

The Sigmacheck 2 is extremely user friendly and can just as easily be operated by a semi-skilled Operator as by Experts. It will be equally at home in the Aerospace, Metals Processing, Casting, Maintenance and Quality Assurance industries as well as appealing to Heat Treatment Specialists and those determining the purity of materials such as gold bullion and coins (counterfeit detection).

Procedural Compliance

The SigmaCheck 2 complies with the requirements of the following inspection procedures:

  • Boeing BAC5651
  • Airbus AITM 6-6004
  • ASTM E1004
  • AMS2658
  • BS EN 2004
  • MIL-STD-1537
  • Bell Helicopter BPS 4453

Applications Include:

  • Material verification / sorting
  • Heat treatment verification
  • Heat or fire damage investigation
  • Material ageing assessment
  • Measuring phosphor content of Cu alloys
  • Monitoring of deposition process for non-ferrous material on a non-ferrous substrate
  • Forged/plated material verification
  • Non-conductive coating thickness measurement
  • Determining the purity / composition of materials i.e. gold bullion and coins
  • Aircraft structures e.g. Paint thickness measurement

SigmaCheck 2_Issue Jan 2024.pdf (1017.9KB)

Industries & Applications

Learn more about Conductivity in our Knowledge Resource.


  • High resolution colour display 7cm (2.8”), 320 pixels by 240 pixels
  • Lockdown mode allows advanced users to lock down features and settings for basic operator mode
  • Accurate conductivity range (0.5% IACS to 110% IACS, 0.28-64 Ms/m)
  • Wide range of frequencies for testing thin materials (60kHz, 120kHz, 240kHz, 480kHz). Option of 960kHz
  • Non-conductive coating thickness. Measurement display up to 0.5mm
  • Lightweight 358 grams (12.6 oz)
  • Ergonomic slim-line case design and easy to hold probe with adjustable finger-grip.



  • Battery life (up to 12 hours)
  • User programmable display
  • 2GB of data storage. Able to store over one million data points
  • Uploaded data can be viewed using MS Excel
  • Multiple languages available. e.g. English, German, French, Spanish
  • Excellent resistance to “edge effect”
  • Rapid Display of Conductivity Results
  • Firmware can be upgraded in field
  • Different probes may be configured by loading the appropriate probe map from SD Card
  • Real-time clock for time and date so that readings can be “time stamped”
  • Real-time PC control via USB or optional RS232 link

Standard Kit

Part #Item
KISIG001B KIT, Instrument, SigmaCheck 2 Conductivity Meter.
ASIG014BAccessory, Dual Conductivity Reference Standards
Nominal value 9.4% IACS (Nickel Silver) & Nominal Value 59.8% IACS
(Aluminium Alloy 1200 - recommended for Aluminium Alloy use)
(SigmaCheck/SigmaCheck 2) NIST Values
ASIG002Accessory, Instrument Stand (SigmaCheck)
ASIG004Accessory, Hard Peli 1400 case, with custom shaped inserts
PSIG001AProbe, Conductivity, Dia 13.00mm, straight Lemo 5-Way
ALL05-L05-015-SIG2Accessory, Lead, 5-Way Lemo to 5-Way Lemo, 1.5m
PSIG002AProbe, Conductivity, Dia 8.00mm, straight, Lemo 5-Way
PSIG003AProbe, Conductivity, Right-Angled, 60,120,240 and 480kHz Dia 13.00mm, 90deg, Lemo 5-Way (SigmaCheck)
A090USB CABLE - A to MINI B, 1m, (RoSH Compliant)
AC005Accessory Ultra portable carry case
A092Power Supply/Battery Charger - USB - Includes, UK, EU, US, AUS and IEC adapters 100-240v (SigmaCheck)
40293Quick Reference Card - SigmaCheck
302392 Ergonomic Probe Skirts for tubes and easy probe handling


Part #Item
ASIG010Accessory, Dual Conductivity Reference Standards, Nominal Values 2.5% and 102% IACS (SigmaCheck) NIST Values
ASIG011Accessory, Dual Conductivity Reference Standards, Nominal Values 8.5% and 101% IACS. Recommended for High Conductivity measurement e.g. Copper & precious metals NPL Values
ASIG004Accessory. Hard Peli 1400 Case with custom shaped foam inserts (SigmaCheck)
40222Machined Red Rubber Boot - SigmaCheck
PSIG002AProbe, Conductivity, Dia 8.00mm, Straight, Lemo 5-Way (SigmaCheck)

Reference Blocks

The conductivity of each reference standard is determined in the central area of the 15mm diameter of the front face by comparison with a similar material, the conductivity of which has been determined in terms of traceable electrical standards.

All supplied blocks are calibrated and the certification of the equipment used in this process is traceable to the National Physics Laboratory (NPL) and the National Institute of Standards and Technology (NIST), and calibrated in accordance with ASTM B193-02.

NB Conductivity Values vary, for current stock values contact us via

ETher NDE offer the following reference blocks:

Conductivity Reference Blocks - NIST

Conductivity Reference Blocks - NPL

Part #Item
ASIG003Reference Block Holder
Holds 5 reference blocks and provides a location to secure a SigmaCheck “top block”


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