As used on the international space station lenspens sensorklear loupe kit helps you check for and eliminate dust from your dslrs sensor resulting in improved image quality the kit contains an illuminated sensor loupe batteries included to examine your sensor and locate any errant particles a hurricane blower to clear loose dust motes as well as a sensorklear ii pen which will aid in removing stickier pieces of dust or grime a carry pouch is also included to keep your cleaning kit cl