As early as 1992, MESA successfully utilized Lambda probes as oxygen probes in the heat treatment field. In 1993, MESA further employed Lambda probes with dew point controllers for heat absorption gas generators, thereby bringing significant changes in cost, accuracy, and lifespan to the necessary process stages of heat treatment, earning widespread recognition from customers. Currently, in the heat treatment industry, such as in European industrial furnaces and automotive parts manufacturing, the original conventional oxygen probes have largely been replaced by sampling oxygen probes (i.e., Lambda probes).