Extech MD10 Non-Contact Magnetic Field Detector Pen — Blue LED Indicator & Built-In Flashlight for HVAC, Automotive, and Industria

The Extech MD10 is a pen-sized, non-contact magnetic field detector with a built-in white LED flashlight that instantly indicates active magnetic fields for safe, fast troubleshooting.

Small but powerful, the MD10 helps technicians, electricians, mechanics, and maintenance personnel quickly determine whether coils, relays, and solenoid valves are energized without opening panels or touching bare conductors. Its bright blue detection LED and integrated white work light make it convenient for cramped, dimly lit environments, while the pen-style body and pocket clip keep the tool ready at hand during routine inspections and diagnostic work.

How does the MD10 reveal an active magnetic field?

Bring the detector tip close to the target component; the MD10 senses magnetic flux and lights a vivid blue LED when a field is present. This non-contact approach lets you confirm coil activation even through plastic housings or protective covers.

• Immediate blue LED indicator when magnetic field detected
• Senses through non-metallic enclosures to avoid panel removal
• Reduces need to probe live conductors, improving safety

Can I use the MD10 in low-light or cramped spaces?

Yes — the MD10 includes a bright white LED flashlight to illuminate tight engine bays, electrical cabinets, and dark control panels. The light helps you position the tip accurately and speeds up inspection tasks in poorly lit areas.

• Integrated white LED for hands-free illumination
• Pen-style form lets you direct light and detector tip precisely
• Lightweight design prevents fatigue during repeated checks

What kinds of equipment can the MD10 test?

The detector is suitable for evaluating magnetic activity in a wide range of electromechanical devices, from HVAC solenoids to automotive relays and industrial control coils. It’s a quick way to verify whether a component is being energized or remains inactive.

• Solenoid valves in pneumatic and hydraulic systems
• Relays and automotive control coils
• Coils and small electromagnets used in industrial automation

How does the MD10 improve on-the-job safety and efficiency?

By detecting magnetic fields without direct electrical contact, the MD10 minimizes exposure to live conductors and reduces time-consuming disassembly. Its fast, visible indication and compact footprint streamline routine diagnostics and troubleshooting.

• Non-contact sensing lowers risk of electrical shock
• Pocket clip and pen shape keep it accessible on the job
• Fewer tools required — detection and illumination in one device

Who is this for: Maintenance technicians, HVAC and refrigeration specialists, automotive technicians, electrical contractors, and industrial mechanics who need a portable, safe, and reliable way to confirm coil and relay activation. The Extech MD10 is especially useful for professionals who frequently troubleshoot in confined or poorly lit locations and want a compact tool that combines magnetic detection with on-board illumination.