This is a recording tool that records the light condition of sunlight in various locations in the home. Help you know whether every corner of the sun in your family has light, whether comfortable, etc. Such asThe balcony in your home, the direction of the sunlight, the temperature when the sunlight comes in, and whether the temperature corresponding to the position you feel is comfortable, whether the light is bright and clean. You can record different periods of time and sunshine exposure, so that you can manage and arrange your living habits at home, so that you can live in a more comfortable and healthy place.