ETher NDE SigmaCheck 2

ETher NDE SigmaCheck 2

Designed and produced by the people who created and manufactured the original Hocking AutoSigma 3000

NDT Supply is the Master Distributor for Ether NDE’s SigmaCheck Conductivity Meter

Speed and Accuracy at a Reasonable Price

The SigmaCheck 2 Eddy Current Conductivity Meter is designed to provide the user with fast and accurate conductivity measurements at a reasonable price. The SigmaCheck 2 is easy to use, whether you are a shop inspector or an engineer.

It meets the requirements for conductivity measurements in the Aircraft manufacture and maintenance fields, where conductivity measurements are used to verify proper alloy/ temper or detect heat damaged components. It is also useful to determine the purity of precious metals or whether they are counterfeit.


  • Material verification / sorting
  • Heat treatment verification
  • Heat or fire damage investigation
  • Lightning damage investigation
  • Material aging assessment
  • Measuring phosphor content of Cu Alloys
  • Monitoring of deposition process for non-ferrous material on a non-ferrous substrate
  • Monitoring the condition of highly stressed parts
  • 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
  • Assessment of aging of alloys


Each probe is supplied with an SD card, which holds the probe's characteristics. This is then inserted into the SigmaCheck being used.

PSIG001A - 13mm

General Purpose

  • Typically used for sheets, bars and extrusions
  • Dia. 13.00 mm
  • Frequency: 60, 120, 240 and 480kHz
  • Lemo 5-Way Connector

PSIG002A - 8mm

Special Purpose Probe

  • Typically used with fasteners and other small parts.
  • Dia. 8.00 mm
  • Frequency: 60, 120, 240 and 480kHz
  • Lemo 5-Way Connector
  • Spring Loaded 8mm Probe Holder (Recommended)

PSIG003A - 13mm, 90°

Right Angled

  • Dia. 13.00 mm
  • Frequency: 60, 120, 240 and 480kHz
  • Lemo 5-Way Connector


At a Glance:

  • High Resolution color display (2.8" / 71mm, 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-conducive coating thickness. Measurement display up to 0.5mm
  • Lightweight (350 grams / 12oz.)
  • Ergonomic slim-line case design and easy to hold probe with adjustable finger grip
  • Two-year warranty on instrument (excludes batteries)


Key Benefits:

  • User programmable display
  • 2GB of data storage. Able to store over one million data points
  • Uploaded data can be viewed using MS Excel
  • Intelligent charger via USB Port
  • Multiple languages available - English, French, German, Spanish, etc.
  • Excellent resistance to "edge effect"
  • Rapid Display of Conductivity Results
  • Battery life up to 9 hrs.
  • 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

High Resolution Display:

The full color 2.8" LCD Display screen is 320x240 pixels providing excellent resolution and displaying conductivity and lift-off results with up to three decimal places precision. The display features an adjustable LED backlight allowing the operator to set their required screen brightness. The operator can also customize both the background colors and text colors to meet their personal preference.

Rapid Display of Conductivity Results:

The SigmaCheck 2 offers a choice of four frequencies (60, 120, 240, 480kHz) to allow the testing of a wide range of material thicknesses. The SigmaCheck 2 is noted for rapid display of conductivity results.

Excellent Data Reporting and Battery Life:

ETher NDE offers Field-Exchangeable probes with their configuration provided via micro SD Card or PC download via USB for the SigmaCheck 2. This removes the need for the instrument to be sent back for matching with the probe. By using a card reader of our PC Software, the new data for the probe can simply be copied onto the SD Card in the instrument, speeding up this process even further. USB PC Connectivity is built into the SigmaCheck 2 for remote control and data logging. The USB Connection offers real time data acquisition as well as eliminating any complicated driver installation. In addition, the USB Connection allows easy charging of the instrument without having to swap the batteries.


Lightweight & Ergonomically Designed:

Weighing 0.77 lbs (350 grams) including batteries and measuring 6.4" long (163mm), 3.1" wide (80mm), and 1" deep (25 mm), the SigmaCheck 2 is compact and extremely lightweight. Housed in a sculpted case with a detachable flexible open-faced removable silicone rubber boot, the SigmaCheck 2 is designed to be fully hand-held. Further, the standard probe has been designed to fit the hand well. Not only is the SigmaCheck 2 very accurate, its ergonomic design makes it a delight to use.

Technical Specifications

ETher NDE SigmaCheck2 Specifications

ETher NDE SigmaCheck2 Specifications
Conductivity Range 0.5% IACS to 110% IACS, 0.28 - 64 MS/m
Operating Frequencies 60kHz, 120kHz, 240kHz, 480kHz. Option of 960kHz
Accuracy Probe must be in thermal equilibrium with test material and instrument and probe stabilized prior to testing.
Minimum 15-minute warm up time for stabilization, 20-30 minutes recommended
At 68°F / 20°C: 0 - 20% IACS: ± 0.05 IACS
At 68°F / 20°C: >20% IACS ± 0.25% of readout
Display Resolution Up to 3 decimal places
Lift Off 13mm probe compensated to 0.020" (0.5mm); 8mm probe compensated to 0.010" (0.25mm)
Temperature Measurement In-probe sensor (accurate to 32.9°F / 0.5°C)
Range 32°F - 122°F / 0°C - 50°C
Automatic Temperature Compensation Conductivity measurements are corrected to the 68°F / 20°C value
Environmental Range 0 to 95% relative humidity, 32°F - 122°F / 0° - 50°C for reliable operation
Display 2.8" (70mm), 320 x 240 pixels color display. LCD with selectable backlight
Construction & Storage High impact, splash-proof, molded UL94-5VA flame-retardant ABS case. Protective rubber boot to protect the unit, probes, probe cable, operator manual on USB and removable stand.
Conductivity Standards On top of unit. Removable for value verification.
Power 2 x 1.5 V AA NiMH Batteries, Approximately up to 9 hours life. Recommended rechargeable batteries: Panasonic Eneloop Pro, 1.2V (min.2500 mAh or equivalent).
Size (L x W x H) 6.4" x 3.1" x 1.0" / 163 x 80 x 25 mm
Weight 0.77 lbs. / 350g. including batteries
Data Logger Removable 2GB micro SD Card allowing over 1 million readings to be stored
PC Connectivity USB port for charger and PC communications
Probes Specification and Dimensions

  • 13mm and 8mm probes operate at 60 kHz to 480 kHz
  • Factory calibration recommended for all probe replacements or additions

13mm and 8mm Size Diagrams

13mm, 90° Size Diagram

Influence of Material Conductivity and Frequency on Minimum Testable Thickness

Minimum Testable Thickness vs. Conductivity at Different Frequencies Conductivity of Common Materials
Material Conductivity (%IACS)
Silver (Ag) (Pure) 117.40
Copper (Cu) 99.995% Min (Vacuum Cast Pure) 102.00
Gold (Au) 99.9% Pure 77.60
Pure Aluminium (Al) 65.86
Aluminium Alloy 2024-0 50.71
Brass 85% Cu + 15% Zn 37.00
Aluminium Alloy 2024-T4 30.25
Nickel - (Pure) (Ni) 25.00
Platinum (Pt) (Pure) 17.50
90% Cu + 10% Ni 11.90
Titanium (Ti) (Pure) 4.10
Stainless Steel Type 309 2.21
Inconel 600 1.67

A range of conductivity reference standards traceable to US and European standards are available for in field use. Up to 5 can be mounted on an aluminum anodized Settings Reference Block Holder (Part Number: ASIG003).


SigmaCheck 2 Introduction

What's in the Box / Accessories

Configure Your Preferences

Basic Calibration

Configure Basic Operation

Basic Operation

Metal Sorting


Data Logging

PC Connectivity

Purchasing Details

Standard Kit Includes:

  • ETherNDE SigmaCheck 2 Instrument (13mm: CM-ET-KISIG001A, 8mm: CM-ET-KISIG001A-8)
  • Either the 13mm probe (CM-ET-PSIG001A) OR 8mm probe (CM-ET-PSIG002A), characterized 60, 120, 240 & 480 kHz
  • Lead Probe Cable, 1.2m (CM-ET-ALL05-L05-012-SIG)
  • Rubber Boot and Case Stand
  • Dual Conductivity Reference Standards, Nominal Values 9.4% and 58.8% IACS (CM-ET-ASIG014)
  • 2 AA NiMH Rechargeable Batteries
  • 2850 mAHr Charger with UK, US, EU Adapter, 100-240 V
  • PC-USB Cable
  • Manual on USB Stick
  • PC Utility on USB Stick
  • Quick Reference Card
  • Calibration Certification
  • Polypropylene Hard Carry Case (CM-ET-AC011)


Optional Extras Available:

  • High-Quality Hard Peli Transit Case with Foam Inserts (CM-ET-ASIG004)
  • Conductivity Test Block Holder (CM-ET-ASIG003)
  • Dual Conductivity Reference Standards, Nominal Values 9.4% and 101% IACS (CM-ET-ASIG010)
  • Dual Conductivity Reference Standards, Nominal Values 28% AND 59% IACS (CM-ET-ASIG012)
  • Other Various Conductivity Standards

 Product Notes

*Product Update - The SigmaCheck (KISIG001) has been upgraded to the SigmaCheck2 (KISIG001A). The new SigmaCheck2 has an upgraded board, increased battery life and improved stability.

*Listed prices only valid for customers in North America.

Description Part # Saved Price Select Option Add to

Instrument Kits

ETher NDE SigmaCheck2 Complete Kit w/ 13 mm Probe CM-ET-KISIG001A $6,275.00
ETher NDE SigmaCheck2 Complete Kit w/ 8mm Probe CM-ET-KISIG001A-8 $6,540.00

Probes & Cases

Probe, Conductivity Probe, Dia 13.00 mm, Straight, Lemo 5-way - for ETher NDE SigmaCheck2 CM-ET-PSIG001A $980.00
Probe, Conductivity, Dia 8.00mm, Straight, Lemo 5-Way - for ETher NDE SigmaCheck2 CM-ET-PSIG002A $1,825.00
Probe, Conductivity, Dia 13.00mm, Right Angled, Lemo 5-Way - for ETher NDE SigmaCheck2 CM-ET-PSIG003A $1,240.00
ETher NDE Spring Loaded 8mm Conductivity Probe Holder (ASIG017) CM-ET-ASIG017 $205.00
Accessory, Lead, 5-Way Lemo to 5-Way Lemo, 1.2m (Silicone Sleeve) - for ETher NDE SigmaCheck / SigmaCheck2 CM-ET-ALL05-L05-012-SIGA $275.00
Accessory, Polypropylene Hard Case (340 x 275 x 123 mm) - for ETher NDE SigmaCheck2 CM-ET-AC011 $320.00
Accessory, Hard Peli 1400 Case with foam inserts - for ETher NDE SigmaCheck2 CM-ET-ASIG004 $605.00

Conductivity Standards

ETher NDE Conductivity Standard - Titanium 6AL-4V (1.0 - 1.1 % IACS) CM-ET-ATBC-TITANIUM $535.00
ETher NDE Conductivity Standard - Titanium, GRADE 2 (3.3 - 4.1 % IACS) CM-ET-ATBC-TITANIUM2 $535.00
ETher NDE Conductivity Standard - Stainless Steel 303 S (2.1 - 2.5 % IACS) CM-ET-ATBC-STST303S $470.00
ETher NDE Conductivity Standard - Nickel Silver LC1291 (9.0 - 9.9 % IACS) CM-ET-ATBC-NICSILVER $350.00
ETher NDE Conductivity Standard - Phosphor Bronze (13.0 - 18.0 % IACS) CM-ET-ATBC-PBRONZE $385.00
ETher NDE Conductivity Standard - Brass CZ 121 (23.3 - 26.6 % IACS) CM-ET-ATBC-BRASS $350.00
ETher NDE Conductivity Standard - Aluminum Alloy 5083 (26.6 - 30.0 % IACS) CM-ET-ATBC-ALU5083 $350.00
ETher NDE Conductivity Standard - Aluminum Alloy 2024-T4 (28.8 - 31.0 %IACS) CM-ET-ATBC-ALU2024-T4 $350.00
ETher NDE Conductivity Standard - Aluminum Alloy 7075-T6 (30.0 - 34.1 % IACS) CM-ET-ATBC-ALU7075 $350.00
ETher NDE Conductivity Standard - Aluminum Alloy 2014A-T6 (34.7 - 40.3 % IACS) CM-ET-ATBC-ALU2014A-T6 $350.00
ETher NDE Conductivity Standard - Aluminum Alloy 6061-T6 (40.5 - 45.0% IACS) CM-ET-ATBC-ALU6061 $350.00
ETher NDE Conductivity Standard - Aluminum Alloy 6082-T6 (45.1 - 49.0 % IACS) CM-ET-ATBC-ALU6082 $350.00
ETher NDE Conductivity Standard - Aluminum Alloy 1200-H4 (57.2 - 62.0 % IACS) CM-ET-ATBC-ALU1200 $350.00
ETher NDE Conductivity Standard - Copper (99.9 - 102.5 % IACS) CM-ET-ATBC-COPPER $350.00
Accessory, ETher NDE Conductivity Test Block Holder Only (holds 5 Conductivity Test Blocks and 1 Dual Conductivity Reference Standard - please purchase separately) CM-ET-ASIG003 $300.00
Accessory, ETher NDE Dual Conductivity Reference Standards, Nominal Values 9.4% and 101% IACS (SigmaCheck / SigmaCheck2) CM-ET-ASIG010 $425.00
Accessory, ETher NDE Dual Conductivity Reference Standards, Nominal Values 28% and 59% IACS (SigmaCheck / SigmaCheck2) CM-ET-ASIG012 $425.00
Accessory, ETher NDE Dual Conductivity Reference Standards, Nominal Value 9.4% IACS (Nickel Silver) & 58.8% IACS (Aluminum Alloy 1200), (Recommended for Aluminum Alloy use). (SigmaCheck / SigmaCheck2) CM-ET-ASIG014 $425.00