Practical primary thermometry for the real world.
Our Johnson noise thermometry programme grows from the precision electronics behind the microK², milliK and our wider work with Isotech. We develop instruments around difficult measurement problems, taking the research through to practical designs. Explore the instruments, the science and the next stage of our JNT work.
Experience you can see in the instruments.
A continuing programme of precision measurement.
We first started working with Isotech in 2004 on the microK. The second-generation microK² builds on the measurement architecture developed through that partnership.
The milliK brought our precision measurement approach to another instrument platform. Isotech brings both to market, supplying, calibrating and supporting them worldwide.
The measurement science behind our instruments.
Developing the microK and milliK meant solving problems in conversion accuracy, noise, switching and stability. We developed converter technology with NPL and Metron Designs, used substitution measurement to cancel common errors, and devised parallel analogue processing to reduce input noise.
Proving those improvements also meant extending our own measurement capability. The instrument design and the methods we use to verify its performance have developed together.
Applying that experience to a different measurement.
Conventional industrial thermometers depend on a calibrated relationship between a sensor’s properties and temperature. Our Johnson noise thermometer determines temperature from the sensor’s electrical noise, measuring its resistance as part of the same process.
Working with NPL, we have developed the electronics and measurement methods needed to take the technique beyond the laboratory.
Current development status.
We are working with application partners to develop practical uses for the thermometer. Follow the programme through our published research and project milestones.
Developed with NPL
Our research collaboration has taken Johnson noise thermometry towards practical industrial use.
Read the papersIndustrial EMC testing
The thermometer passed the more demanding industrial immunity category.
See the published resultsThermoSI programme
Our high-temperature development continues within the European research consortium.
Follow the programmeKeep up with our JNT work.
News and programme updates are posted on our LinkedIn page.
Research and development. Worldwide reach.
We first started working with Isotech in 2004 on the microK, and we continue to work closely on precision instrumentation, with Metrosol carrying out research, design and development, and Isotech bringing the instruments to market, supplying, calibrating and supporting them worldwide.
On 2 April 2026, Metrosol became part of the Isotech group, continuing to operate with our own staff.
How we work togetherInstruments, calibration and support at Isotech