This process is named time-of-flight measurement. The inner circuitry takes advantage of this timing to calculate the distance, providing immediate digital readouts which can be much more specific than handbook procedures. A number of feet off is a large challenge but for my utilizes I feel two or three mm https://www.eltegypt.com/News/newsdetails/%D9%83%D9%84-%D9%85%D8%A7-%D8%AA%D8%AD%D8%AA%D8%A7%D8%AC-%D9%85%D8%B9%D8%B1%D9%81%D8%AA%D9%87-%D8%B9%D9%86-%D8%AC%D9%87%D8%A7%D8%B2-%D9%82%D9%8A%D8%A7%D8%B3-%D8%A7%D9%84%D9%85%D8%B3%D8%A7%D9%81%D8%A7%D8%AA-%D8%A8%D8%A7%D9%84%D9%84%D9%8A%D8%B2%D8%B1/43