1. Safety Information
Please read and understand all safety information before operating this laser level. Failure to follow these instructions may result in laser radiation exposure, electric shock, fire, or serious injury.
- Laser Radiation: This product emits Class II laser radiation. Do not stare directly into the laser beam. Avoid direct eye exposure.
- Power Source: Use only the specified charging cable and wall charger. Ensure the power source matches the device's requirements.
- Battery Safety: The device uses a 5200mAh lithium battery. Do not disassemble, short-circuit, or expose the battery to high temperatures or fire. Dispose of batteries properly.
- Environment: Operate the device in a clean, dry environment. Avoid exposure to water, dust, and extreme temperatures. The device has an IP54 rating for splash and dust resistance, but it is not fully waterproof.
- Children and Pets: Keep the laser level out of reach of children and pets.
- Maintenance: Do not attempt to service the device yourself. Refer all servicing to qualified personnel.
2. Product Overview
The POPOMAN MTM350B is a versatile 3D laser level designed for various leveling and alignment tasks. It projects three 360° green laser lines (two vertical, one horizontal) for comprehensive coverage. Its robust design and rechargeable battery make it suitable for both professional and home use.
2.1 Package Contents
- 1 x POPOMAN MTM350B 3D Laser Level
- 1 x USB-C Charging Cable
- 1 x Wall Charger
- 1 x 5200mAh Rechargeable Lithium Battery
- 1 x Magnetic Pivoting Base
- 1 x Auxiliary Supporting Bracket
- 1 x User Manual
- 1 x Carry Case

Figure 2.1: Complete package contents of the MTM350B laser level.
2.2 Product Features
- 3 x 360° Green Laser Lines: Provides one horizontal and two vertical lines for full room coverage.
- High Visibility: Green laser is significantly brighter than red lasers, improving visibility in various lighting conditions.
- Self-Leveling Mode: Automatically levels within ±4° ±1° range, indicating out-of-level conditions.
- Manual Mode: Locks the pendulum for projecting lines at any angle.
- Pulse Mode: Extends working distance up to 197ft (60m) with a laser receiver (not included).
- Long Battery Life: Equipped with a 5200mAh rechargeable lithium battery for up to 8 hours of continuous operation.
- USB-C Charging: Convenient charging via USB-C, with overcharge protection.
- Durable Design: IP54 rated for water and dust resistance, covered by TPR soft rubber for shock protection.
- Versatile Mounting: Includes magnetic pivoting base and auxiliary supporting bracket, with 1/4''-20 tripod thread.

Figure 2.2: Key features of the POPOMAN MTM350B laser level.
2.3 Parts Identification

Figure 2.3: Labeled components of the MTM350B laser level.
- Laser ON/OFF Switch: Controls the laser beam activation.
- All-Inclusive Soft Rubber (IP54): Provides durability and protection against dust and splashes.
- USB Charging Port: For connecting the USB-C charging cable.
- Replaceable Battery Compartment: Houses the 5200mAh lithium battery.
- Pendulum Lock: Used to switch between self-leveling and manual modes, and to secure the pendulum during transport.
- 1/4"-20 Screw Hole: For mounting the device on a tripod or other compatible accessories.
3. Setup
3.1 Unboxing and Initial Inspection
Carefully remove all components from the carry case. Inspect the laser level and accessories for any signs of damage. Ensure all listed package contents are present.
Video 3.1: This video demonstrates the unboxing process of the POPOMAN MTM350B laser level and its accessories.
3.2 Battery Installation and Charging
The MTM350B comes with a 5200mAh rechargeable lithium battery. Before first use, remove the protective film from the battery and fully charge it.
- Open the battery compartment cover on the side of the laser level.
- Insert the 5200mAh lithium battery, ensuring correct polarity.
- Close the battery compartment cover securely.
- Connect the USB-C charging cable to the laser level's charging port and the other end to the wall charger.
- Plug the wall charger into a power outlet. The battery indicator on the device will show charging status.
- The device can also operate while connected to a power source directly without the battery.

Figure 3.1: The laser level can be charged via car charger, power bank, laptop, or AC adapter.
3.3 Mounting Options
The MTM350B offers flexible mounting solutions for various applications.
- Magnetic Pivoting Base: Attach the laser level to the magnetic pivoting base using the 1/4"-20 screw hole. This base allows for attachment to metal surfaces and provides rotational adjustment.
- Auxiliary Supporting Bracket: Use this bracket for additional support or to clamp the laser level to various surfaces.
- Tripod Mounting: The 1/4"-20 screw hole on the bottom of the laser level is compatible with standard tripods (not included).

Figure 3.2: The laser level can be mounted using an adjustable clip, magnetic adsorption, or hang buckle design.
Video 3.2: This video illustrates how to attach and set up the L-shape bracket with the POPOMAN MTM350B laser level.
4. Operating Instructions
4.1 Powering On/Off
To power on the device, slide the pendulum lock switch to the unlocked position. To power off, slide the pendulum lock switch back to the locked position.
4.2 Self-Leveling Mode
When the pendulum lock switch is in the unlocked position, the laser level will automatically self-level. If the device is outside its self-leveling range (±4° ±1°), the laser lines will flash rapidly to indicate an out-of-level condition. Adjust the device's position until the lines stabilize.
Video 4.1: This video demonstrates how to switch between different laser modes on the POPOMAN MTM350B.
4.3 Manual Mode (Slope Function)
To project lines at a specific angle, engage the manual mode:
- Slide the pendulum lock switch to the locked position.
- Press and hold the power button for a few seconds until the laser lines activate without self-leveling. The lines will remain static, allowing for angled projection.
- To exit manual mode, slide the pendulum lock switch to the unlocked position, then back to locked, or power off the device.
4.4 Pulse Mode
Pulse mode is used to extend the working range of the laser level when using an optional laser receiver (not included). This is particularly useful for outdoor applications or in bright conditions.
- Ensure the laser level is in self-leveling mode (pendulum unlocked).
- Press the 'P' button (Pulse Mode button) on the control panel. The laser lines will begin to pulse, and the pulse mode indicator will light up.
- Align the laser receiver with the pulsing laser line.
- To deactivate pulse mode, press the 'P' button again.
4.5 Switching Laser Lines
The MTM350B allows you to activate different combinations of laser lines:
- Press the power button briefly to cycle through the available laser line combinations (e.g., horizontal only, vertical only, all lines).

Figure 4.1: The laser level supports five different line modes for various applications.
4.6 Applications
The 3D laser lines are ideal for a wide range of tasks:
- Floor Installation: Project horizontal lines for accurate tile laying or flooring installation.
- Wall Decoration: Use vertical and horizontal lines for hanging pictures, shelves, or wallpaper.
- Ceiling Installation: Project lines onto the ceiling for light fixture placement or ceiling decoration.
- Partitioning: Create precise layouts for installing partitions, screens, or door panels.

Figure 4.2: Examples of the laser level's use in floor installation, furniture assembly, picture hanging, and tile work.

Figure 4.3: The laser level assists in precise alignment for tasks like wallpapering and staircase renovations.
5. Maintenance
- Cleaning: Regularly clean the laser windows and the device body with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Storage: When not in use, store the laser level in its original carry case in a dry, cool place, away from direct sunlight. Ensure the pendulum lock is engaged before storage or transport.
- Battery Care: For long-term storage, charge the battery to approximately 50% and recharge every 3-6 months to maintain battery health.
- Calibration: If you suspect the laser level is out of calibration, refer to the troubleshooting section or contact customer support. Do not attempt to recalibrate the internal components yourself.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Laser lines are flashing rapidly. | Device is out of self-leveling range. | Place the device on a more level surface or adjust its position until the lines stabilize. |
| Laser lines are dim or not visible. |
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| Device does not power on. |
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| Laser lines are not straight or accurate. |
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7. Specifications
| Feature | Detail |
|---|---|
| Brand | POPOMAN |
| Model | US-MTM350B |
| Laser Beam Color | Green |
| Projection | 3 x 360° (1 Horizontal, 2 Vertical) |
| Laser Class | Class II, <1mW power output |
| Working Distance | 147ft (45m) |
| Working Distance (with Detector) | 197ft (60m) |
| Leveling Accuracy | ±1/9 inch at 33Ft (±3mm at 10m) |
| Self-Leveling Range | ±4° ±1° |
| Battery Type | 5200mAh Lithium Ion (included) |
| Operating Time (all lasers on) | Up to 8 hours |
| Charging Port | USB-C |
| IP Rating | IP54 (splashproof and dustproof) |
| Tripod Thread | 1/4''-20 |
| Material | Plastic + Soft Rubber + Electronic Components |
| Product Dimensions | 4.76 x 3.5 x 4.57 inches |
| Item Weight | 4.19 pounds (1900 Grams) |
| Certifications | FDA/ FCC/ ROHS/ IEC 60825-1:2014 |
8. Warranty & Support
POPOMAN provides a 2-year quality promise for the MTM350B laser level. For warranty claims, technical support, or any questions regarding your product, please contact POPOMAN customer service through the official website or your purchase platform.
For more information and support, visit: www.popomantools.com

