1. Introduction
Congratulations on the purchase of your HILDA Laser Distance Meter. This manual provides essential information for the safe and effective use of your instrument. Please read all instructions carefully before operation. The person responsible for the instrument must ensure that all users understand and adhere to these directions.
The HILDA Laser Distance Meter is a professional tool designed for precise distance, area, and volume measurements, featuring an electronic angle sensor and data storage capabilities.
2. Safety Instructions
2.1 Laser Safety
WARNING: This digital laser meter is a Class II laser product. Please observe the following safety precautions:
- Do not look directly at the laser beam when using this instrument at any time.
- Do not use this product with other optical products (e.g., binoculars, telescopes) to avoid serious laser damage radiation.
- Do not damage any safety warning signs on the instrument.
2.2 General Safety Notes
- Read all contents of this manual carefully before using the instrument. Failure to do so may result in dangerous laser radiation injury or electric shock.
- Do not use the instrument under unstable conditions.
- Keep the instrument away from children.
- Do not attempt to disassemble or modify this instrument. Doing so may increase laser emission power and cause unnecessary personal injury.
- Keep this manual for future reference.
2.3 Prohibited Uses
- Users opening or repairing the instrument by themselves.
- Using the instrument directly into the sun.
- Using the instrument outside its specified scope.
- Immersing the instrument in water.
- Wiping the lens with organic solvent.
- Wiping the lens directly with your hands or other rough objects.
- Using a power supply outside the rated voltage to power the instrument.
3. Setup
3.1 Battery Installation
- Open the battery cover.
- Install or replace 3x AA alkaline dry batteries according to the battery polarity mark at the end of the battery compartment.
- Close and fasten the battery cover.
Cautions:
- Please use batteries from regular manufacturers.
- Do not use old and new batteries together.
- When the instrument shows low battery, please replace the battery in time.
- Remove the batteries if not using the instrument for a long period.
- Waste batteries should be recycled according to relevant national or local regulations.
4. Product Overview
4.1 Screen Display Icons Introduction
The display provides visual feedback on the current mode, measurements, and device status:
| Icon/Indicator | Description |
|---|---|
 | Area Measurement |
 | Volume Measurement |
 | Pythagorean Measurement |
 | Double Pythagorean Measurement |
 | 1m Calibration Function |
 | Continuous/Maximum-Minimum Measurement |
 | Measurement Datum |
 | History Memory |
 | Electron Angle |
 | Battery status |
4.2 Menu Function (Keypad Layout)
| Button | Function |
|---|---|
| MEAS (Red button) | Turn on / Start Measurement |
| FUNC | Function Key (e.g., Area, Volume, Pythagorean) |
| MAX/MIN | Continuous/Maximum-Minimum Measurement Key |
| U (Reference Point/Unit Switch) | Switch Key for Datum/Unit |
| +/- (Sound/Addition) | Buzzer switch / Addition and subtraction keys |
| Record Icon | Record view / record switch Key |
| CLEAR (Power Icon) | Turn off / Clear off Key |
5. Operating Instructions
5.1 Turn On/Off
- Turn On: Press the MEAS key to turn on the instrument. The backlight will activate, and it will automatically switch to single measurement mode.
- Turn Off: Long press the CLEAR key for 2 seconds to turn off the instrument. If there is no activity on the instrument within 30 seconds, the laser beam will turn off automatically. The instrument will power off completely after 3 minutes of inactivity.
5.2 Buzzer Switch
- The product's default buzzer is turned on.
- To turn off the buzzer, long press the +/- button.
- To turn on the buzzer again, long press the +/- button.
5.3 Reference Setting
- The default reference side of the instrument is the rear reference, indicated by the icon.
- Press the U key to set the datum to the front. The screen will display a corresponding icon.
- Press the U key again to return to the rear datum.
5.4 Unit Selection
- The default unit is metric meters (m).
- Long press the U key to switch the measurement unit.
- Available units: m (meter), ft (feet), in (inch), ft+/in (feet-inch -1/16).
5.5 Clear Off
- Short press the CLEAR key to clear the last action or line-by-line data.
- When marking area or volume measurements, each single measurement can be deleted and re-measured.
5.6 Measurement Modes
Short press the FUNC button to cycle through different measurement functions.
5.6.1 Single Distance Measurement
- With the instrument turned on, short press MEAS to activate the laser.
- Direct the laser beam to the measured item.
- Press MEAS again to trigger the single distance measurement. The result will be displayed immediately.
5.6.2 Continuous/Maximum-Minimum Measurement
- Press MAX/MIN to enter continuous measurement function.
- The display will show the minimum value, maximum value, and current value from top to bottom.
- Press MEAS to stop measuring. Press MEAS again to continue.
- The instrument performs up to 100 continuous measurements, then automatically finishes.
5.6.3 Area Measurement
- Press FUNC until the Area Measurement icon appears.
- Measure the length and width as prompted by the display. The area (S=a x b) will be calculated automatically.
5.6.4 Volume Measurement
- Press FUNC until the Volume Measurement icon appears.
- Measure the length, width, and height as prompted. The volume (V=a x b x c) will be calculated automatically.
5.6.5 Pythagorean Measurement (Indirect Measurement)
- Press FUNC until the Pythagorean Measurement icon appears.
- Follow the on-screen prompts to measure the required sides (e.g., hypotenuse and one leg) to calculate the unknown side (c = √(a² - b²)).
5.6.6 Double Pythagorean Measurement
- Press FUNC until the Double Pythagorean Measurement icon appears.
- Follow the on-screen prompts to measure the necessary segments to calculate the desired height (e.g., C1 = √(a² - b²) - √(d² - b²)).
5.7 Addition and Subtraction Measurement
- Press +/- for addition function. The next measurement will be added to the previous one.
- Press +/- again for subtraction function. The next measurement will be subtracted from the previous one.
5.8 Data Record and Data Query Function
The instrument automatically stores measurement data.
- Query Call Storage Data: In the initial state, press the button to enter data query mode.
- Browse Measured Value: Short press the button to browse through stored values.
- This product can store up to 50 groups of data.
6. Specifications
| Parameter | LDM-D50 | LDM-D70 | LDM-D100 | LDM-D120 |
|---|---|---|---|---|
| Measuring range | 0.05m-50m | 0.05m-70m | 0.05m-100m | 0.05m-120m |
| Measuring accuracy | ±2mm | ±2mm | ±2mm | ±2mm |
| Display accuracy | 1mm | |||
| Laser classification | Class 2 | |||
| Laser type | <1mW | |||
| Area, Volume measuring | ✓ | |||
| Indirect (Pythagoras) measurement | ✓ | |||
| Plus-minus method | ✓ | |||
| History memory | ✓ | |||
| Continuous measurement | ✓ | |||
| Minimum/maximum measurement | ✓ | |||
| Buzzer | ✓ | |||
| Multiple lines mode | ✓ | |||
| Protection against splashes and dust | IP54 | |||
| Temperature range for Operation | 0°C~+40°C | |||
| Temperature range for Storage | -10°C~+50°C | |||
| Battery life | 5000 measuring | |||
| Battery selection | LR6 (AAA)3*1.5V | |||
| Laser switch-off automatically | After 30 seconds | |||
| Instrument switch-off automatically | After 3 minutes | |||
Note on Measurement Accuracy: The stated measurement accuracy is achieved under favorable working environments. In adverse conditions (e.g., high illumination, large temperature differences, or non-ideal measured surface), the final measurement data may be affected.
7. Maintenance
7.1 Care and Cleaning
- Do not immerse the instrument in water.
- Wipe off dirt with a damp soft cloth.
- Do not use aggressive cleaning agents or solutions.
7.2 Considerations for Measurement Surfaces
- Transparent or Colorless Objects: When measuring objects like water or clean glass, wrong measurements may occur due to the transparent characteristics.
- Highly Reflective Objects: If the measured object has a very strong reflection, the laser may be reflected off, leading to incorrect measurements.
- Non-reflective or Very Dark Surfaces: When measuring non-reflective or very dark surfaces, the measurement time may increase, and the measurement error may also increase.
8. Troubleshooting
All information is displayed as an icon or "error". The following information can be corrected:
| Error Code | Reason | Solution |
|---|---|---|
| ERR11 | Code run error | Return to factory for repair |
| ERR21 | The measurement feedback signal is too weak / the measured object shakes / the measured object is not clear | Use a reflector / keep the object under test still |
| ERR22 | Over range | Keep within the measuring range of the machine for use |
| ERR31 | Calculation error, Pythagorean theorem and measurement error of right-angled side and hypotenuse when measuring height difference, resulting in inability to calculate | Please measure according to the order shown by the icons |
9. User Tips
- The device is generally accurate at short distances. For longer distances, be aware of potential technical tolerances.
- Consider applying a screen protector to prevent scratches on the display.
- The device is cost-effective and provides good measurements for its price point.
- It is easy to use, making it suitable for various applications, including ventilation installation.
- Utilize the various measurement functions, including angle measurement, for comprehensive data collection.
- If you encounter an ERR21, ensure you are using a reflector or that the object being measured is stable and clear.
10. Warranty and Support
10.1 Quality Guaranty
The company provides a free warranty for users within one year from the date of purchase. The conditions for the validity of this warranty service are as follows: operate, handle, clean, and maintain the tool correctly according to the company's operating instructions, and maintain the tool in good technical condition. This means that only original parts and spare parts can be used in the tools. This warranty only provides free repair or replacement of defective parts throughout the expected life of the tool. If parts need to be repaired or replaced due to normal wear and tear, they are not covered by this warranty. All pictures, descriptions, and technical parameters are subject to change without prior notice.
10.2 Additional Resources
A detailed user manual in PDF format is available for download. Please refer to the official product page or contact customer support for the link.
For further assistance, please contact HILDA customer support.