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Everything Eddy Current

Probes/Accessories ARCHIVE

Test Blocks

Test Blocks and Calibration Test Blocks are essential for all NDT inspections.

We offer a full range of Eddy Current (ECT) Test Blocks and hold plenty in stock for those times when they seem to just disappear from your inspection kit!

As leaders in Eddy Current (ET) NDT, we also understand the need for EC Test Blocks to be perfectly set is essential. We ensure that all our test blocks are delivered in a timely matter and ready to test from the first moment. If you have a specific Eddy Current (ECT) Test Block query, please email us directly via​

Download our Probe Catalogue

Short Form Probe Catalogue (1.7MB)

ETher NDE Probe Catalogue (1.4MB)

Conductivity Test Blocks (ATBC)

Used as a reference in the application of electrical conductivity measurement of non-ferrous metals, ideal for both laboratory and field use.


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.

Blocks are calibrated at 20oC, at a frequency of 60 kHz and to an accuracy of +/- 1.2% of the value or +/-0.4% IACS, whichever is less.

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

ETher NDE offer the following reference blocks:

Conductivity Reference Blocks - NIST (click to download)

Conductivity Reference Blocks - NPL (click to download)

Test Block Coding

Part No Material %IACS          (Value Range) Siemens/m.    (Value range)
ATBC-Copper Copper (99.9 - 102.5) (57.9 - 59.5)
ATBC-ALU1200 Aluminium Alloy, 1200-H4 (56.0 - 62.0) (32.5 -36.0)
ATBC-ALU6082 Aluminium Alloy, 6082-T6 (45.1 - 49.0) (26.2 - 28.4)
ATBC-ALU6061 Aluminium Alloy, 6061-T6 (40.5 - 45.0) (23.4 - 26.1)
ATBC-ALU2014A-T6 Aluminium Alloy, 2014A-T6 (34.7 -40.3) (20.1 - 23.4)
ATBC-ALU7075 Aluminium Alloy, 7075-T6 (30.0 - 34.1) (17.4 - 19.8)
ATBC-ALU5083 Aluminium Alloy, 5083 (26.6 - 30.0) (15.4 - 17.4)
ATBC-BRASS Brass, CZ 121 (23.3 - 26.6) (13.5 - 15.4)
ATBC-PBRONZE Phosphor Bronze (13.0 -18.0) (7.5 - 10.4)
ATBC-NICSILVER Nickel Silver, LC1291 (9.0 - 9.9) (5.2 - 5.7)
ATBC-STST3035 Stainless Steel, 303 5 (1.6 - 2.5) (0.9 - 1.4)
ATBC-TITANIUM Titanium, 6AL-4V (1.0 - 1.1) (0.6 - 0.7)



Rotating (ATBR)

Rotating probe test blocks are available in a number of materials with a large variety of defect types, used to enable correct calibration of rotating probes.

Individual hole and Multi-Hole formats are available.


Part No: Description Material

Accessory, Test Block, Rotating probe, Total 12 holes;  Holes 3/16", 1/4", 5/16", 3/8", 7/16", 1/2" 6 sound holes and 6 holes with Flaws

Aluminium 7075-T6

Accessory, Test Block, Large Rotating Probe, 1/8" up to 1" with 0.5mm side drilled holes + Slots 0.2, 0.5 and 1mm deep. 

Aluminium 7075-T6


Screenshot 2021-12-21 at 15.06.32.png



Part No: Description Material Hole (dia mm) Hole 1 Hole 2
Accessory, Test Block, Rotating, Material Type (A, F, T or S), Hole Diameter (mm) xxx, Defect Type in Hole 2 X.
ATBRAxxxX Test Block, Rotating Probe Aluminium Alloy 7075-T6

Hole Dia. xxx.      

Example: 12.7mm=127

Defect Free Hole

Defect Type X

(Standard)  Side Drilled Hole (dia:1mm)

Corner Notch         (0.030" x 0.030")

Through Notch (0.020" deep x 0.004" wide)



Screenshot 2021-12-21 at 15.30.41.png









Part No: Description Airbus Part No: Dia.     (d)mm Dia. (D)mm
ATB-SC-T-03-07 Test Block, Split Conical, Titanium, 3 -7mm   SCCS3-7TI 3 7
ATB-SC-T-07-14 Test Block, Split Conical, Titanium, 7 -14mm SCCS7-14TI 7 14
ATB-SC-T-14-21 Test Block, Split Conical, Titanium, 14 -21mm SCCS14-21TI 14 21
ATB-SC-T-21-28 Test Block, Split Conical, Titanium, 21 -28mm SCCS21-28TI 21 28
ATB-SC-T-28-40 Test Block, Split Conical, Titanium, 28 -40mm SCCS28-40TI 28 40
ATB-SC-A-03-07 Test Block, Split Conical, Aluminium, 3 - 7mm   SCCS3-7AL 3 7
ATB-SC-A-07-14 Test Block, Split Conical, Aluminium, 7 - 14mm SCCS7-14AL 7 14
ATB-SC-A-14-21 Test Block, Split Conical, Aluminium, 14 - 21mm SCCS14-21AL 14 21
ATB-SC-A-21-28 Test Block, Split Conical, Aluminium, 21 - 28mm SCCS21-28AL 21 28
ATB-SC-A-28-40 Test Block, Split Conical, Aluminium, 28 - 40mm SCS28-40AL 28 40
ATB-SC-FE-03-07 Test Block, Split Conical, Titanium, 3 - 7mm   SCCS3-7FE 3 7
ATB-SC-FE-07-14 Test Block, Split Conical, Titanium, 7 - 14mm SCCS7-14FE 7 14
ATB-SC-FE-14-21 Test Block, Split Conical, Titanium, 14 - 21mm SCCS14-21FE 14 21
ATB-SC-FE-21-28 Test Block, Split Conical, Titanium, 21 - 28mm SCCS21-28FE 21 28
ATB-SC-FE-28-40  Test Block, Split Conical, Titanium, 28 - 40mm SCCS28-40FE 28 40

Related Products

Industries & Applications


Slotted (ATB)

General Purpose test blocks with slots.Screenshot 2021-12-22 at 14.44.18.png

Slotted Test blocks are general purpose with 0.2mm (0.008”), 0.5mm (0.020”) and 1.0mm (0.040”) slots to enable correct calibration.


Part No: Description  Material
Accessory, Test Block, Material
ATBF Accessory. Test Block, Ferrous (Steel EN1A), 0.2, 0.5, 1.0mm slots  Ferrous (Steel EN1A)
ATBA Accessory. Test Block, Aluminium Alloy 7075-T6, 0.2, 0.5, 1.0mm slots  Aluminium Alloy 7075-T6
ATBT Accessory. Test Block, Titanium 6A14V,  0.2, 0.5, 1.0mm slots Titanium 6A14V 
ATBS Accessory. Test Block, Stainless Steel 304, 0.2, 0.5, 1.0mm slots (AUSTENITIC)  Stainless Steel
ATBS5316 Accessory. Test Block, Stainless Steel 316, 0.2, 0.5, 1.0mm slots  Stainless Steel 316 



Weld (ATBW)
Screenshot 2021-12-22 at 15.01.15.png

Coating thickness calibration standard with 0.5mm (0.02”), 1.0mm (0.04”) and 2.0mm (0.08”) slots including 4mm x 0.5mm (0.02”) shims, used in conjunction with broad band (paint) probe PUB100k to set sensitivity levels before weld inspection.

Part No: Description Material

Accessory. Test Block, Weld Probe, Ferrous  (Steel EN1A) + 4 x 0.5mm Shims, 0.5, 1.0, 2.0mm slots.

Ferrous (Steel EN1A) + 4 x 0.5mm Shims
ATBWDUP Accessory. Test Block, Weld Probe, Duplex, 2205 4 x 0.5mm Shims, 0.5, 1.0, 2.0mm slots ​​​​​​. Duplex + 4 x 0.5mm Shims ​​​​​​​​​​​​​​



Surface Probe Test Block

Screenshot 2021-12-22 at 15.04.52.png







Part No: Description Material
ATB001 Accessory, Test Block, Aluminium 7075-T6, 1.6mm Thick, x4 Flat Bottom Holes 75%(1.2mm), 50%(0.8mm), 25%(0.4mm), 2.5%(0.2mm), Deep.  Aluminium 7075-T6