Sondes are designed into robotic crawlers and thrust cameras and emit an electromagnetic subject which is receivable by EM locators or possibly a sonde locator. They allow GPRS Task Managers to accurately map sewer lines as part of a utility Find or movie pipe inspection. Magnetic flux leakage: identifies defects https://idoseobro.blogspot.com/2024/09/soil-testing-lab-essential-for-every.html