Introduction
This manual provides detailed instructions for the safe and effective use of your LASELION LT50 Laser Distance Meter. The LT50 is a high-precision measurement tool designed for various applications, offering a maximum range of 50 meters (165 feet). It features multiple measurement modes, a built-in level bubble, and a mute function for versatile and convenient operation. Please read this manual thoroughly before using the device.

Image: Front view of the LASELION LT50 Laser Distance Meter, displaying its screen and control buttons.
Product Overview
Package Contents
The LASELION LT50 package includes the following items:
- 1 x LASELION LT50 Laser Distance Meter
- 2 x AAA Batteries
- 1 x User Manual
- 1 x Carrying Pouch
- 1 x Wrist Strap

Image: Contents of the LASELION LT50 package, including the device, batteries, manual, pouch, and wrist strap.
Key Features
- 50m (165ft) Maximum Range: Capable of measuring distances up to 50 meters with high precision.
- Multiple Measurement Functions: Supports area, volume, continuous measurement, and Pythagorean theorem modes.
- Built-in Level Bubble: Ensures accurate horizontal alignment for reliable results.
- Mute Function: Allows for silent operation in sensitive environments.
- Unit Conversion: Easily switch between metric (m) and imperial (ft/in) units.
- Automatic Storage: Stores up to 100 data sets.
- Durable Design: IP54 splash-proof and dustproof for use in various environments.
- Compact & Portable: Lightweight and easy to carry.
Device Layout and Buttons

Image: Diagram illustrating the LASELION LT50's display icons and button functions, including Measure, Menu, Addition/Subtraction, Continuous Measurement, Memory, Unit, Clear/Mute, and Power ON/OFF.
Refer to the diagram above for the location and function of each button and display icon:
- Measure Button: Initiates a measurement.
- Menu Button: Accesses measurement modes and settings.
- Addition + / Subtraction - Button: Performs calculations.
- Continuous Measurement Button: Activates continuous measurement mode.
- Memory Button: Accesses stored measurements.
- Unit Button: Switches measurement units and reference points.
- Clear (Return) / Mute Button: Clears current measurement or mutes sound.
- Power ON / OFF Button: Turns the device on or off.
Setup
Battery Installation
- Locate the battery compartment on the back of the device.
- Open the battery compartment cover.
- Insert two AAA batteries, ensuring correct polarity (+/-).
- Close the battery compartment cover securely.
The device requires 2 x 1.5V AAA alkaline batteries. New batteries are included in the package.
Operating Instructions
Power On/Off
- To turn on: Press the Power ON / OFF button.
- To turn off: Press and hold the Power ON / OFF button for a few seconds. The device will also automatically shut off after a period of inactivity.
Setting Reference Point and Units
The LT50 allows you to set the measurement reference point from either the front or the back of the device. You can also switch between different measurement units.
- To switch reference points (front/back): Short press the Unit button.
- To switch measurement units (m/ft/in/ft+in): Long press the Unit button.

Image: Visual guide demonstrating how to switch between front and back reference points and cycle through measurement units (meters, feet, inches, feet+inches) on the LASELION LT50 display.
Basic Distance Measurement
- Point the laser at the target.
- Press the Measure button once. The laser will activate.
- Press the Measure button again to take the measurement. The result will be displayed on the screen.
Measurement Modes
The LT50 offers several measurement modes for various applications. Press the Menu button to cycle through the available modes.

Image: Examples of various measurement modes including single measurement, continuous measurement, distance measurement, area calculation, volume calculation, and Pythagorean mode.
- Single Measurement: Standard distance measurement.
- Continuous Measurement (Min/Max):
Press the Continuous Measurement button. The device will continuously measure and display the current, minimum, and maximum distances. Press the button again to stop.

Image: Display showing continuous measurement with minimum and maximum values.
- Area Measurement:
Select area mode. Take two consecutive distance measurements (length and width). The device will automatically calculate and display the area.
- Volume Measurement:
Select volume mode. Take three consecutive distance measurements (length, width, and height). The device will automatically calculate and display the volume.
- Pythagorean Mode:
Used for indirect measurement of heights or distances. Follow the on-screen prompts to measure the hypotenuse and one leg of a right-angled triangle. The device will calculate the unknown side.
Addition and Subtraction
The LT50 can add or subtract measurements.
- Take the first measurement.
- Press the Addition + / Subtraction - button (short press for addition, long press for subtraction).
- Take the second measurement. The result of the calculation will be displayed.

Image: Display showing an example of adding two measurements together.
Mute Function
To operate the device silently, activate the mute function.
- Long press the Clear (Return) / Mute button to toggle the key tone on or off.

Image: The mute function icon on the display, indicating the device is operating without key tones.
Automatic Storage
The device automatically stores up to 100 sets of measurement data. When the memory is full, the oldest record will be overwritten by the newest measurement.
- To view stored data: Press the Memory button.
- Use the arrow buttons (if available, or cycle through with Memory button) to navigate through the stored records.

Image: The LASELION LT50 displaying multiple stored measurement values, illustrating its automatic data storage capability.
Maintenance
- Cleaning: Use a soft, damp cloth to clean the device. Do not use abrasive cleaners or solvents.
- Storage: Store the device in its carrying pouch in a cool, dry place when not in use. Remove batteries if storing for extended periods to prevent leakage.
- Laser Lens: Keep the laser lens clean to ensure accurate measurements. Use a soft cloth, similar to cleaning camera lenses.
- Water and Dust Resistance: The device is IP54 rated, meaning it is protected against dust ingress and splashing water. However, it is not fully waterproof and should not be submerged.

Image: The LASELION LT50 shown in dusty and wet environments, illustrating its dustproof and IP54 splash-proof capabilities.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not turn on | Low or dead batteries; incorrect battery installation. | Replace batteries with new AAA batteries; ensure correct polarity. |
| Inaccurate measurements | Dirty laser lens; unstable measurement surface; incorrect reference point setting; strong light interference. | Clean the laser lens; ensure a stable measurement; verify reference point; measure in shaded areas if possible. |
| Laser not visible | Bright ambient light; long distance measurement. | Measure in lower light conditions; use a target plate for long distances. |
| Display error message | Measurement out of range; internal error. | Ensure target is within 50m (165ft) range; restart the device. If error persists, contact support. |
Specifications
| Feature | Detail |
|---|---|
| Brand | LASELION |
| Model Number | LT50 |
| Measuring Range | 50 meters (165 feet) |
| Accuracy | ±1/16 inch (±2mm) |
| Measurement Speed | 0.5 seconds |
| Laser Class | Class II, Power Output <1mW |
| Units of Measurement | m, ft, in, ft+in |
| Automatic Storage | Up to 100 data sets |
| Battery Type | 2 x 1.5V AAA Alkaline Batteries |
| Material | Acrylonitrile Butadiene Styrene |
| Color | Black |
| Item Weight | 100 Grams (3.53 ounces) |
| Dimensions | 5.87 x 3.74 x 1.85 inches (Package Dimensions) |
| IP Rating | IP54 (Dustproof, Splash-proof) |
Warranty and Support
The LASELION LT50 Laser Distance Meter comes with a 1-year warranty from the date of purchase.
For technical support, warranty claims, or any questions regarding your device, please contact LASELION customer service through the retailer where the product was purchased or refer to the contact information provided in the included user manual.