Home > Surveying Equipment > Magnetic Locators
Reliable Detection of Buried Ferrous Objects
Magnetic locators are essential tools for surveyors, utility contractors, municipalities, and construction professionals who need to locate buried ferrous objects quickly and accurately. Common applications include finding survey monuments, property pins, valve boxes, manhole covers, rebar, and other iron or steel targets that may be hidden below the surface.
At Bench Mark, we offer professional magnetic locators from trusted manufacturers including SubSurface Instruments and Schonstedt. Designed for demanding field conditions, these instruments provide dependable detection performance, simple operation, and long-term durability. Whether locating property corners, utility infrastructure, or construction control points, magnetic locators help improve efficiency while reducing time spent searching for buried targets.
Detection depth depends on the target’s size, orientation, and the model you use. The SubSurface ML-1 detects ferrous objects up to 10 feet deep, which covers most property pins, survey monuments, and utility markers. Larger ferrous targets like valve boxes and iron pipes are typically detectable at greater depths than a small steel rod or rebar cap.
Target size, burial depth, object orientation, soil conditions, and nearby metal structures can all influence locator performance. Understanding these factors helps operators interpret signals more effectively and improve target recovery in the field.
The ideal magnetic locator depends on the types of targets being located, expected detection depths, environmental conditions, and user preferences. Surveyors locating property monuments may have different requirements than utility crews searching for valve boxes, manholes, or buried iron infrastructure.
Yes. Vehicles, fences, reinforced concrete, utility infrastructure, and other large ferrous objects can influence magnetic field readings. Awareness of surrounding conditions helps improve target identification and locating efficiency.
If you regularly work in wet environments, heavy vegetation, or utility corridors, yes. The SubSurface ML-3S is IP68 rated for full submersion up to 250 feet, so rain, standing water, or dropping it in a ditch won’t take it out of service. For dry-condition work, a standard model like the ML-1 or Schonstedt GA-52Cx is a more cost-effective choice.
Professional magnetic locators are built to last for years of daily field use. The SubSurface ML-1, for example, is backed by a 7-year manufacturer warranty, well beyond what most consumer-grade metal detectors offer, reflecting how durable these instruments are meant to be.
Yes, but a magnetic locator is usually the better professional tool when the property pin is made from iron or steel. Magnetic locators are designed to detect ferrous survey markers, monuments, and buried iron objects.
For surveyors and contractors, the best tool is usually a professional magnetic locator because it is designed to detect buried ferrous property pins and survey monuments.
Proven tools for surveying and utility locating
The SubSurface ML-3S and Schonstedt GA-52CX remain two of the most widely used magnetic locators in the surveying industry. Both models are trusted for their durability, ease of use, and ability to locate buried ferrous objects accurately in challenging field conditions.
The ML-3S features waterproof construction, lightweight design, extended battery life, and advanced signal processing capabilities, making it a popular choice for surveying professionals. The Schonstedt GA-52CX continues to be a proven industry standard, valued for its simplicity, rugged construction, and reliable performance across a wide range of locating applications.
4 Models, Matched to Real Field Conditions
The right choice comes down to your typical targets and how wet your work site gets. Each name links to the full product page.
Magnetic Locator | Best For |
Property pins and survey markers, up to 10 ft deep | |
Wet field conditions, utility and municipal work (IP68, submersible to 250 ft) | |
Rugged, simple, industry-standard daily professional use | |
Underwater or shoreline locating |
Equipment and guidance from experienced professionals
Choosing the right magnetic locator depends on the type of targets being located, expected detection depths, and field conditions. Bench Mark supplies professional locating equipment supported by knowledgeable staff who understand the practical requirements of surveying, construction, and utility locating applications.
In addition to competitive pricing and trusted products, we provide ongoing technical support to help customers select, operate, and maintain their equipment. Whether purchasing a first magnetic locator or expanding an existing fleet, our team is available to help identify the right solution for the job.
