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SigmaCheck Specification and Kit 

The SigmaCheck Eddy Current (ECT) Conductivity Meter from ETher NDE is a truly up-to-the-minute EC Conductivity Meter on the non-destructive testing (NDT) market.

In comparison, the SigmaCheck has many features that far out weigh the competition.

The first thing you will notice when switching on the SigmaCheck is the high resolution, colour, graphic display. The SigmaCheck ET Conductivity Meter is also lightweight, ergonomically designed and boasts a rubber boot for easy grip.

On a more technical level, the SigmaCheck has specification advantages over the competition. These include:

+ More available frequencies (60kHz, 120kHz, 240kHz, 480kHz plus an optional 960kHz)

+ Read out of Coating Thickness and Lift Off

+ Easy to use data logging (emphasis on the "easy to use")

+ USB.R-232

+ Multiple charging options (rechargeable batteries and USB charging)


Inspection Technology 

Eddy Current

Operating Frequencies 

60 kHz, 120 kHz, 240 kHz, 480 kHz, 960 kHz.

Conductivity Range

0.5 % IACS to 110 % IACS, 0.28-64 MS/m


At 20 °C. At 10 % IACS: ±0.1 % IACS. At 100 % IACS: ±0.5 % IAC Over Range 0-40°C: At 10% IACS:±0.2% IACS. At 100% IACS: ±0.8% IACS. Probe in thermal equilibrium with metal.

Display Resolution 

Up to 3 decimal places

Lift Off

13 mm probe compensated to 0.020” (0.5mm) 7 mm probe compensated to 0.010” (0.25 mm)

Temperature Measurement

In-probe sensor (accurate to 0.5 °C) Range 0 °C to + 50 °C

Automatic Temperature


Conductivity measurements are corrected to the 20°C value.

Environmental Range 

0 to 95% relative humidity, 0°C to + 50°C for reliable operation


2.8” (70mm) 320 x 240 pixels colour display. LCDwith selectable backlight.

Construction & Storage

High impact, splash-proof, moulded UL94-5VAflame-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, and when attached ensures thermal equilibrium.


2 x 1.5 V AA NiMH Batteries, Approx up to 6 hrs life. Can also use non-rechargable AA cells.


163mm Long x 80mm Wide x 25mm Deep


350g (0.77 pounds) including batteries

Data Logger Memory 

Removable 2GB micro SD Card allowing over 1million readings to be stored.

PC Connectivity

USB port for charger and PC communications


12.7 mm diameter for 60 kHz to 480 kHz. 7 mm probe operates at 480 kHz & 960 kHz. 

Probes are interchangeable with simple operator resetting procedure. Probes are field exchangableand do not require return to manufacturer for calibration.


Settings Reference Blocks - A range of conductivity references standards tracable to USand European standards are available for in-field use. Up to five can be mounted on an aluminiumanodised holding plate.



SigmaCheck Kit:

sigmacheck standard kitThe SigmaCheck ECT Conductivity Meter Standard Kit includes:

+ Detachable, durable rubber boot with useful belt strap

+ Mains charger

+ Calibration blocks on head of unit

+ Detachable back stand

+ Ergonomically designed probe



Optional Extras & Accessories:

sigmacheck in case
The SigmaCheck EC Conductivity Meter comes with most things as standard. However if you require any extras, you will see from the list below what else is available to accompany the Sigmacheck. Simply give us a call or email us at This email address is being protected from spambots. You need JavaScript enabled to view it. with your conductivity application query and we will be sure to put together the right SigmaCheck kit for you. 

brochure link    This email address is being protected from spambots. You need JavaScript enabled to view it.