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Available in the client
This tool relies on native device capabilities and cannot run directly in a web browser. Choose one of the supported clients below to continue.
After opening the client, search for āMagnetic Field Detectorā to start.
Reads your phoneās magnetometer and shows magnetic field changes in ĀµT, helping you find nearby magnetic objects and sources of interference.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
The Magnetic Field Detector is an App tool that displays the magnetic field measured by your deviceās built-in magnetometer. It combines the three axis readings into one field-strength value, shown in microtesla (ĀµT). A magnetometer measures the field around the phone; it does not identify an object, name a material, or estimate how far away a source is.
That distinction matters if you searched for a phone metal detector. A change may be a useful clue that the magnetic environment changed, but it cannot tell you whether the cause is a particular object. The website page explains the tool; the live sensor reading runs in the ToolKK App on a device with a magnetometer. The App has English labels. The separate mini-program interface is Chinese-language only.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Use the Magnetic Field Detector in the ToolKK App. If the sensor is unavailable, that device cannot provide this reading through the tool.
Hold the phone still for a moment away from obvious magnets, speakers, chargers, and other electronics. Note the displayed value as a local reference; it is not expected to be zero.
Keep the phone facing the same way as you move it toward the area you want to compare. If the number changes, return to the reference spot and repeat the pass. A repeatable change is more informative than a single jump, but still does not identify its cause.
Use cases
See how the tool fits into real work and everyday tasks.
Compare the reading with the phone held still at two distances from a small magnet. This can illustrate how the nearby field changes; it does not calibrate the magnet or establish a detection range.
Take readings in the same phone orientation before and after moving away from a speaker or powered device. The comparison can show that the surroundings affect the sensor, without measuring electrical safety or diagnosing the device.
Q&A
Find concise answers to common questions and confusing cases.
No. It reports magnetic-field strength, not material composition. Some objects can affect a local field while others may not create a noticeable change at the phone. A reading alone cannot confirm that an object is metal.
The sensor measures along the phoneās three axes, and turning the device changes its orientation relative to the surrounding field. Nearby magnets, speakers, and electronics can also affect the value. Compare readings with the phone held in a consistent orientation.
It is the Appās display threshold for flagging an elevated reading. It is not a universal metal-detection cutoff, a calibrated measurement claim, or a safety limit.
The device may not have an available magnetometer, or the sensor may be unavailable in that session. The tool displays an unavailable message when it cannot read the sensor. A lack of change does not prove that no object is nearby.
Notes
Review scope, result limitations, and important precautions before use.
Phone sensor hardware, orientation, calibration, and nearby magnetic influences vary. This toolās display is for observing changes; no real-device precision or calibration certificate is established. It cannot verify a precious metal, locate buried objects at a known depth, or replace a purpose-built detector.
Do not use a phone reading to decide whether a wall is safe to drill, whether wiring is live, or whether an exposure is safe. A magnetometer reading cannot rule out pipes, cables, or non-magnetic materials. For construction, electrical, workplace, or other safety decisions, use equipment designed for that task and follow the relevant professional procedures.
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