Two temperature fixed points, triple point of water (273.16 K) and argon (83.8058 K), were developed to be used in magnetic fields. As their temperature values are not affected by magnetic fields, they serve as ideal tools to study the magnetic field effects on the various temperature sensors. For example, a correction function for a platinum resistance thermometer was proposed with a basis on the results at the triple point of water and its applicability was assessed by argon triple point to have an accuracy of 3%.