IET is the World's Leading Resistance Calibration Standard Manufacturer

With 50+ years of stability data and history, IET Labs manufactures a full line of resistance standards that will cover most any budget and application.

From the world's most stable to our cost-effective models From 1 mΩ to 10 TΩ Contact us if you don’t find the resistance standard you need and we would be happy to custom build it for you.

IET Labs, maintains some of the finest R, L and C calibration standards in the World.
Almost all of IET’s resistance standards are manufactured with pride in the USA.

SRX/SRC Series Economical Resistance Standard
Wide range of values - 1 mΩ to 10 TΩ
Very stable - as low as 10 ppm/yr
ISO-17025 accredited calibration included
3 Year warranty included
Excellent TC - as low as 1 ppm/°C
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SRL Series Precision Resistance Standard
Very stable - up to 2 ppm/yr
Wide range of values - 1 mΩ to 1.9 TΩ,
Used by national measurement institutes across the world
3 Year warranty included
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SR102/103/104 Series
Highest accuracy (1 ppm/yr) and stability (±0.5 ppm/yr typical) of any resistance standard
Lowest temperature coefficients (< 0.1 ppm/ºC)
Available in 3 models: 100Ω, 1000 Ω, 10,000Ω.
Has remained the foremost resistance standard, with no equivalent, for over 35 years
5 Year Warranty Included
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PRS-370 Self-Adjusting Programmable Resistance Box & RTD Simulator
Resistance range: 0.1 Ω to 20 MΩ with a Resolution of 1 μΩ or 6 digits
Precision lab grade Resistor Standard with accuracy
Manual or Programmable decade resistor with IEEE interface and Labview drivers
No long term maintenance or calibration cost -with an 5 year warranty
Designed for customers who own an 8.5 digit DMM (Fluke 8508A, 8588A¹ or Keysight 3458A)
The most revolutionary decade resistor ever!
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DCCS DC Current Shunt Series
Allows for high current calibration, up to 60 A
Resistances ranges from 100 µΩ - 1 kΩ
High accuracy 0.02%
Suitable for direct current & audio frequencies
Oil-filled design ensures great long term stability <0.01% over many years
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VRS-100 Series High Resistance Standards
Set of nine, ten or eleven resistors - 1 kΩ, 10 kΩ, 100 kΩ,1 MΩ, 10 MΩ, 100 MΩ, 1 GΩ, 10 GΩ, 100 GΩ, 1 TΩ and 10 TΩ , open circuit (Depending on model)
High Accuracy - up to 20 ppm
Standard voltage: up to 5 kV (voltages of 10 kV are available)
Excellent for calibration of Meggers
For higher resistance values above 10 TΩ see SRC-T Network Standards
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SRR Series High Accuracy Standard Resistor
High accuracy four-terminal standard resistors
Resistance Value of: 0.001 Ω, 0.01 Ω, 0.1 Ω
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SRAC Standard Resistors Designed for Use At AC
Precision ac/dc resistance standards designed for use up to 10 kHz
Available for values from 1 mΩ - 10 MΩ, Contact IET for custom values
Very stable <20 ppm/year for most values at ac and dc
Calibrated at dc and 1 kHz
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HARS-LX Series Decade Resistance Substituter Lab Standard
High accuracy - as good as 20 ppm
High stability - as good as 5 ppm/yr
Over 55 models available with resistance from 1 mΩ to 121.1 MΩ
Resolution as good 1 mΩ with a fixed decade or 20 μΩ with a rheostat.
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esi SR1010 Resistance Transfer Standard
Resistance Transfer Standards available in the following values 1 Ω, 10 Ω, 100 Ω, 1 kΩ, 10 kΩ, 100 kΩ
Initial Accuracy... ± 20PPM of nominal value matched within 10PPM
Transfer Accuracy... ± (1PPM + 0.1uΩ at parallel value) for 100:1
Transfer Accuracy... ± (1PPM + 1uΩ at series parallel value) for 10:1
Long Term Accuracy... ± 50PPM of nominal value
Calibration Accuracy... ± 10PPM
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esi SR1030 Series Oil Immersed Transfer Standard
Resistance Values of 1 Ω - 100 kΩ
Initial Accuracy... ± 20 PPM of nominal value matched within 10 PPM
Transfer Accuracy... ± (1 PPM + 0.1uΩ at parallel value) for 100:1
Long Term Accuracy... ± 50 PPM of nominal value
Calibration Accuracy... ± 10 PPM
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esi SR1050 Series 1M & 10 M Resistance Transfer Standard
Resistance Values 1 MΩ & 10 MΩ
Initial Accuracy... ± 25 or 30 ppm of nominal value matched within 10 ppm
Transfer Accuracy... ± 2 ppm (Typical Short-term Repeatability)
Calibration Accuracy... ± 10 or 15 ppm
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esi SR1 Calibration Resistor
New Design, with improved specifications
Versatile working calibration resistor
Laboratory standard of high accuracy and stability
Adjusted to within 20 ppm of nominal
50 ppm long-term accuracy for most values
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LOM-530 Micro-Ohmmeter Calibration Kit
Complete set of (5) working standard resistors for calibration of micro-ohmmeters.
Resistance values can be custom modified per your requirement.
Calibrates a wide verity of micro-ohmmeters from various manufacturers
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SCR-5156-IET Electrometer Calibration Standard
4 resistance standards 100 MΩ to 100 GΩ
1 nF and 100 nF capacitors for charge calibration
Accuracy: 1%
Accredited calibration certificate
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SRX-NI-4082 Standard Resistor Calibration Set
Owned used and recommend by National Instruments
Very stable - drift < 50 ppm/yr
Excellent temperature coefficient - 2 ppm/°C
Rugged
Set consists of 4 resistance standards: 25 Ω, 125 Ω, 5 kΩ, 100 kΩ values as recommended by NI PXIe-408x calibration procedure
3/4" spacing for direct connection to the NI PXIe-4082
Low inductance < 0.08 µH
Accredited Calibration
In addition to the standard values, any custom value is available. Please contact the IET sales department, for more information
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SRC-100T-TN Resistance Standard
High resistance standard based upon a T network design
3 lower value resistors simplifies calibration
Wide range of values - 10 TΩ to 100 TΩ
Very stable - 500 ppm/yr
ISO-17025 accredited calibration included
3 Year warranty included
Excellent TC - 25 ppm/°C
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Resistance Standards

IET is the World's Leading Resistance Calibration Standard Manufacturer