The experiment measured the distance by comparison with cartridge m.How to measure the distance from the walls of the trial is on the ground floor building with khom ลอัลตรา Tel engineering ultrasonic kathiap with bearings, m.
The experiment measured the distance by the tape test method is to measure the distance from the wall of the ground floor of the terminal building, engineering, telecom Ultrasonic compared to tape.
The experiment measured the distance by comparing with the measuring tape
the experimental method is to measure the distance from the wall on ground floor engineering building มฯ with telecommunication module, ultrasonic compared with measuring tape .