Isothermal Technology Ltd (Isotech) is a UK manufacturer of temperature calibration equipment and metrology standards, founded in 1980 and headquartered in Southport, Merseyside. The company produces a comprehensive range of calibration products spanning primary metrology standards to industrial field calibrators. Core offerings include ITS-90 fixed point cells for national measurement institutes, Standard Platinum Resistance Thermometers (SPRTs), microK precision thermometry bridges (awarded the Queen‘s Award for Enterprise Innovation in 2017), Jupiter series dry block calibrators, liquid calibration baths, and blackbody infrared calibrators. Isotech operates ISO/IEC 17025 accredited calibration laboratories in the UK and USA, providing traceable temperature calibration services. The company serves metrology institutes, accredited calibration labs, and industrial users across aerospace, pharmaceutical, power generation, and manufacturing sectors.