VejiA LDM-50H Laser Distance Meter Instruction Manual

1. Introduction

Thank you for choosing the VejiA LDM-50H Laser Distance Meter. This professional device is designed to provide high-accuracy measurements for various applications, making it an ideal tool for construction, interior design, and DIY projects. Its compact and portable design allows for easy single-person operation, even in hard-to-reach areas.

2. Safety Information

WARNING: LASER RADIATION

Do not stare directly into the laser beam. This product emits Class 2 laser radiation. Maximum output is less than 1mW at a wavelength of 630-670nm. Always operate the device responsibly and follow all safety guidelines.

Please read this instruction manual carefully before using the device to ensure safe and proper operation.

Image: Back view of the LDM-50H, highlighting the battery compartment and the laser safety warning label. The label indicates Class 2 laser product with output <1mW and wavelength 630-670nm, advising users not to stare into the beam and to read the manual for safety.

3. Product Features

• High accuracy: ±1.5 mm
• Measurement range: 0.05 to 50 meters (164.2 ft)
• Multiple measurement modes: Single distance, continuous measurement, area, volume, Pythagoras (indirect measurement)
• Shortcut keys for addition, subtraction, area, volume, and Pythagoras calculations
• Min/Max distance tracking during continuous measurement
• Backlit multi-line display for clear readability
• Buzzer indicator for measurement confirmation
• Improved performance for outdoor use
• Dust and splash-proof: IP54 rating
• Stores up to 20 measurement records
• Durable soft-touch keypad
• Automatic laser shut-off after 0.5 minutes of inactivity
• Automatic instrument shut-off after 3 minutes of inactivity

4. Setup

4.1 Battery Installation

1. Locate the battery compartment cover on the back of the device.
2. Slide the cover open in the direction indicated by the arrow.
3. Insert two (2) 1.5V AAA batteries, ensuring correct polarity (+/-).
4. Close the battery compartment cover securely.

4.2 Powering On/Off

• To power on: Press the MEAS button. The laser will activate.
• To power off: Press and hold the CLR button for a few seconds, or the device will automatically shut off after 3 minutes of inactivity.

Image: A hand holding the LDM-50H, demonstrating its compact size and the clear digital display. The main measurement (MEAS) button is visible, along with other function keys.

5. Operating Instructions

5.1 Basic Distance Measurement

1. Press the MEAS button once to activate the laser.
2. Aim the laser dot at the target point.
3. Press the MEAS button again to take a measurement. The result will be displayed on the screen.

5.2 Changing Measurement Units

Press the Unit button to cycle through available units: meters (m), inches (in), and feet (ft).

5.3 Continuous Measurement / Min/Max Tracking

1. Press and hold the MEAS button for approximately 2 seconds to enter continuous measurement mode.
2. As you move the device, the current distance, minimum distance, and maximum distance will be displayed in real-time.
3. Press the MEAS button again to exit continuous measurement mode.

5.4 Addition and Subtraction

To add or subtract measurements, take the first measurement, then press the + or - button, take the second measurement, and press MEAS to get the result.

Image: A close-up, top-down view of the LDM-50H's control panel. The display shows multiple measurement lines, and all function buttons including MEAS, CLR, Unit, and mode selection keys are clearly visible.

6. Measurement Modes

6.1 Area Calculation

1. Press the Mode button (often indicated by a square icon) until the area icon appears on the display.
2. Measure the first side (length) by pressing MEAS.
3. Measure the second side (width) by pressing MEAS.
4. The device will automatically calculate and display the area.

6.2 Volume Calculation

1. Press the Mode button until the volume icon (cube) appears.
2. Measure the length, width, and height sequentially by pressing MEAS after each measurement.
3. The device will automatically calculate and display the volume.

6.3 Pythagoras Mode (Indirect Measurement)

This mode allows for indirect measurement of heights or distances using the Pythagorean theorem. There are typically two or three different Pythagoras modes (e.g., two-point or three-point measurement). Refer to the icons on the device for specific instructions.

1. Press the Mode button until the desired Pythagoras icon appears.
2. Follow the on-screen prompts to measure the required sides of the triangle (e.g., hypotenuse, base).
3. The device will calculate and display the unknown side.

7. Maintenance

• Cleaning: Use a soft, damp cloth to clean the device. Do not use abrasive cleaners or solvents.
• Storage: Store the device in a dry, cool place away from direct sunlight. If storing for extended periods, remove the batteries to prevent leakage.
• Battery Replacement: Replace batteries when the low battery indicator appears on the display. Always use new 1.5V AAA batteries.
• Laser Lens: Keep the laser emission and reception lenses clean. Dust or dirt can affect measurement accuracy.

8. Troubleshooting

9. Specifications

10. Warranty and Support

This product is manufactured to high-quality standards. For warranty information, please refer to the documentation provided at the time of purchase or contact your retailer. In case of technical issues or questions not covered in this manual, please contact the customer support channel provided by your seller.