The present invention includes an apparatus for aerosol measurement having a high concentration of particles the apparatus comprising a diluter for diluting the concentration of particles in a sample aerosol stream to form a diluted aerosol stream, and a sensor for detecting the particles in the diluted aerosol stream by vapor condensation, droplet growth and optical detection. The base region includes one or more physical structures. The DCDC converter further includes: a detection circuit which detects an external magnetic field and outputs a signal that is different depending on whether or not the detected magnetic field exceeds a predetermined threshold; and a control circuit performing a control of the DCDC converter according to the signal, to suppress an overcurrent of the DCDC converter in a strong magnetic field. However, the housing generally hampers access to the primary power input after installation of the appliance. This invention further relates to soybean seeds, plants, and plant parts produced by crossing the soybean variety XB48T04 with another soybean variety.