Although “International Temperature Scale of 1990” has the word “scale” in its title, this is a misnomer that can be misleading. ITS-90 is not a scale; it is an "equipment calibration standard". Temperatures measured with equipment calibrated per ITS-90 may be expressed using any temperature scale such as Celsius, Kelvin, Fahrenheit, or Rankine. For example, a temperature can be measured using equipment calibrated to the kelvin-based ITS-90 standard, and that value may then be converted to, and expressed as, a value on the Fahrenheit scale (e.g. 211.953 °F).