The ultrasonic device is very suitable for a family to decorate, purchase an area of air conditioning volume calculation. Suitable for real estate agents or construction workers. Ultrasonic device can measure a straight distance from 0.50 m to 18 m. Using emitting ultrasound for the object to be tested, the ultrasonic time to be determined from the distance is measured. For construction, decoration, engineering, etc., you can perform power measurement with a traditional tape measure.