Locating & Detecting
A Magnetic Locator will find only ferrous metals, generally at greater depths.
The magnetic locator will not 'see' other types of metals and so will not be subject to signal interference from them - things like aluminum cans, pull tabs and other common "trash" materials found in many environments. Most ideal tool for the Surveyor.
For general ferrous, non ferrous, cavities, tunnel, pipes etc the use of metal detectors or geophysical scanners / locators can be used
Frequently asked Question about the Site Pro Smart Track Magnetic Locator
What is the difference between the CST/Berger Magna Track, made in Malaysia and the latest SMART-Track Locator made in USA
Answer: These are two very different products.
One is very old electronic technology (Old analogue circuit erase feature, time limit on erase values) and no IP rating and the other is a 2016 design with state of the art electronics plus over 9 additional features.