MAJOR TECH MT300 (01) PDF Document

Please adhere to the following safety warnings when using the MAJOR TECH MT300:

• Read the instruction manual carefully to ensure correct measurement parameters and maintain the life of the equipment.

• Do not use this meter in flammable and explosive environments.

• Used batteries and discarded instruments should not be disposed of with household waste. Please handle them according to relevant national or local laws.

The MAJOR TECH MT300 detector can detect metal in walls, ceilings, and floors, including steel bars, copper pipes, and cables. It can also detect wooden beams, metal, and cables under plasterboard.

The key functions and parts of the MAJOR TECH MT300 are:

1. Display interface

2. Yellow indicator

3. Red indicator

4. Center of detection area (Position can be marked by the center hole)

5. Green indicator

6. Metal/Cable Detection Button

7. Foreign object detection button (Long press to switch between Exact mode and Deep mode)

8. Type-C charging port (The red indicator ③ is on when charging; the green indicator ⑤ is on when fully charged)

9. On/Off button

10. Reset hole

The display interface of the MAJOR TECH MT300 includes the following indicators:

A – Precise mode in “Foreign Object Detection” mode (maximum detection depth is 20mm).

B – Detection mode icons, arranged in order as alternating current, foreign objects (wooden stalls), and metal.

C – Depth mode in Foreign Object Detection mode (maximum detection depth is 38mm).

D – Magnetic/Nonmagnetic Icon.

E – Battery percentage.

F – Sound icon. Press the “Foreign Object Detection” (⑦) and “Metal/Cable Detection” (⑥) buttons at the same time to turn the sound on or off.

G – Metal detection depth display, which shows the distance from the center of the detection area to the object.

H – Timber Detection Preparation Tips (shows wall calibration progress).

I – Indicates the distance from the edge of the measured object to the center of the detector. Only the “Center” icon is displayed in metal mode.

J – Detection signal strength display area.

• Use a Type-C interface with a charger that has a voltage output of 5V and a current of ≥500mA.

• Before starting, ensure there is no moisture on the detection area. Dry the detector with a cloth if necessary.

• Do not allow moisture to penetrate the detector or leave it in direct sunlight for a long time.

• If the detector is exposed to extreme temperature differences, wait for its temperature to stabilize before use.

• Do not use transmitting equipment like microwave ovens near the detector, as they can affect results.

• Environmental factors like proximity to strong magnetic/electromagnetic fields, moisture, metallic building materials, foil-laminated insulation, and conductive wallpaper or tiles can affect detection results.

• Before drilling or nailing, always check for and turn off electrical, gas, and water supplies.

For the best scanning results with your MAJOR TECH MT300, follow these practices:

• Avoid wearing jewelry like rings or watches, as metal can cause inaccurate detection.

• Move the tool evenly across the wall surface; do not lift it or change the applied pressure.

• When detecting foreign objects, the tool must always be in contact with the wall surface during the scan.

• Ensure the fingers of the hand holding the tool do not touch the surface being scanned.

• Do not touch the detector or the scanned surface with your other hand or any other part of your body.

• Always detect slowly for maximum accuracy and sensitivity.

1. Turn on the detector. It will default to “metal detection” mode. If a signal is present without any metal nearby, calibration is needed.

2. To calibrate, place the detector in an environment free of metal and strong magnetic fields (e.g., lift it into the air). Press and hold the “Metal/Cable Detection” button (⑥) until the signal display returns to zero and the green light turns on. Release the button; calibration is complete.

3. The maximum detection depth for metal is 120mm.

4. Press the metal detection button to ensure you are in the metal detection state. The metal detection pattern will appear on the display, and the green indicator will light up.

5. Place the detector on the surface and move it left or right. As you get closer to a metal object, the signal strength scale and percentage will gradually increase.

6. As you move away, the signal strength will decrease.

7. When the signal reaches its maximum, the “Center” icon appears, indicating the metal object is directly below the center of the detector. The yellow or red indicator will also light up.

8. If an AC signal is detected simultaneously, the red indicator will flash, and the detector will beep continuously.

• When the detector displays a non-magnetic metal symbol, the object is likely a wire or copper pipe.

• When the detector displays a magnetic metal symbol, the object is likely a steel bar.

• If neither symbol is displayed, the object is likely an alloy.

• If the AC symbol flashes, there is an AC signal nearby.

The accuracy of the displayed depth value is related to the shape, material, and distribution of the measured metal object, as well as the properties of the surrounding medium. The accuracy is best when the measured object is a standard steel bar or copper pipe with a diameter of 18mm. For other objects, the depth value should be used as a rough reference value.

This mode detects objects in gypsum drywall, plywood sheathing, and wood walls. It does not work on concrete, mortar, bricks, carpets, foil-faced materials, or metal surfaces.

1. Press the “Foreign Object Detection” button (⑦) to enter the mode. The foreign object icon will appear on the screen. Long press this button to switch between Precise mode (20mm depth) and Deep mode (38mm depth).

2. Vertically attach the instrument to the wall. Briefly press the “Foreign Object Detection” button again and hold the instrument still for 1-3 seconds to complete calibration (the green light will turn on).

3. Move the instrument evenly and slowly across the surface without lifting it.

4. As you approach the edge of an object, the signal percentage and boundary icons will appear and increase.

5. When you are over one edge of the stud, the “Edge” character will be displayed with half of the border icon.

6. Continue moving. When the instrument is in the middle of the stud, the “Center” character will appear, both border icons will be displayed, the red light will turn on, and the buzzer will emit a long repetitive beep as the signal percentage reaches its maximum.

7. As you move past the center, the signal will decrease, the center icon will disappear, and the buzzer will stop.

8. When you reach the other edge of the stud, the “Edge” character will appear again.

9. Continue moving away until the signal disappears and the green light turns on, completing the detection.

Tip: To differentiate wood from metal, first perform a metal scan to mark any metal items. Then, scan in foreign object mode. Items detected in this mode but not in metal mode are likely wooden studs.

Erratic scan results or false alarms can be caused by various environmental factors.

• Recalibrate: Briefly press the foreign object detection mode button until the green light turns on again to manually recalibrate.

• Moisture: Erratic results may be due to moisture in the wall cavity, drywall, or from paint or wallpaper that is not fully dry. Wait for the wall to dry completely.

• Uneven Surfaces: On certain surfaces, it can be difficult to detect wooden dowels. In this case, switch to metal detection mode to locate the nails or screws that hold the material to the dowels, which makes them easier to find.

• Recent Calibration: If you just calibrated on a wooden stud, you must move the tool away from the stud before it can be detected again.

The maximum detection depth is 50mm (for 220V@50Hz / 110V@60Hz).

1. Press the “Detect Live Cable button” to enter live cable detection mode. The AC icon will appear on the display.

2. If the signal strength percentage is displayed before you start, calibration is needed. Press and hold the “Detect live cable button” on the surface until the signal percentage on the display returns to zero and the green light is on. Release the button.

3. Place the detector on the surface and move it left or right. As you get closer to a live cable, the signal strength scale and percentage will gradually increase.

4. When the program determines the signal is at its maximum, the “Center” icon appears on the display. This means the live cable is located just below the center of the detector. The yellow or red indicator will light up, and the buzzer will make a short beep sound.

Several factors can affect live wire detection:

• Shielding: “Live” wires cannot be detected with certainty if they are behind metallized or conductive surfaces, shielded in metal conduits, or behind surfaces with high moisture content. Concrete, brick, and ceramic surfaces also have a shielding effect.

• Power: Detection is easier if the connected appliance is turned on, drawing current through the wire.

• Signal Spread: The electric field from a “live” wire can spread, making the alerted area seem much larger than the actual wire.

• Humidity/Static: High humidity or strong static electricity on the wall can cause a false alarm. To fix this, long-press the detection cable button on the wall to recalibrate until the green light is on and the signal is at zero. If the signal doesn’t zero out, the humidity or surrounding electromagnetic radiation is too high for an accurate reading.

• Static Electricity: Static can cause inaccurate detection. Placing your free hand on the wall next to the detector may help remove static and improve results.

• Non-Live Wires: Wires that are not “live” may be detected as metallic objects or may not be detected at all.

• Use a dry, soft cloth to wipe dirt off the instrument. Do not use detergents or solvents.

• Do not put any labels or nameplates on the detection area on the back two sides.

• Do not stick on any metal nameplates.

• Use the included protective case to store and carry the detector.

• Please recycle and reuse damaged detectors, accessories, and packaging materials in an environmentally friendly manner.