This process is called time-of-flight measurement. The inner circuitry works by using this timing to compute the distance, supplying speedy digital readouts that may be much more specific than handbook procedures. Several ft off is a large situation but for my employs I feel a handful of mm could well 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