650nm 5mW Red Line Laser Diode Module — Adjustable Focus, 120° Fan Angle, 5V, Chrome Brass Housing
650nm 5mW Red Line Laser Diode Module — Adjustable Focus, 120° Fan Angle, 5V, Chrome Brass Housing
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⚠️ LASER SAFETY — READ BEFORE USE
This module emits a visible laser beam (~5mW, Class IIIa/3R). Never point at eyes, faces, animals, aircraft, or vehicles. Direct or reflected laser light can cause eye injury. Always follow proper laser safety precautions.
Need a crisp, visible reference line for alignment, leveling, or positioning? The 650nm 5mW Red Line Laser Module projects a sharp red laser line — not a dot — with a wide 120° fan angle that covers large surfaces in a single sweep. The adjustable focus ring lets you fine-tune the line's sharpness and width for different distances, and rotating the lens also changes the line's orientation for horizontal or vertical alignment.
Built into a durable 12mm chrome-plated brass housing with pre-wired 135mm (5") leads and a built-in driver circuit, it's completely plug-and-play — just connect 5V and ground. Drawing only ~30mA, it can be powered directly from an Arduino digital pin for programmable control.
⚠️ Important: The metal case is not electrically isolated — it is tied to the laser diode's anode and will be at the same voltage as your power supply. Do not ground the case or allow it to contact grounded metal surfaces, as this will short-circuit and damage the module.
⚡ Key Features
- Line beam, not a dot: Projects a sharp red laser line across surfaces — ideal for alignment, leveling, and cutting guides.
- Wide 120° fan angle: Covers large surfaces and long distances in a single projection.
- Adjustable focus: Rotate the threaded lens to fine-tune line sharpness and width. Rotating also changes line orientation (horizontal ↔ vertical).
- Ready to use: Built-in driver circuit — no external resistor or driver needed. Just connect 5V and ground.
- Pre-wired: ~135mm (5") color-coded leads already soldered — no soldering required.
- Chrome-plated brass housing: 12mm diameter × 35mm long — durable, corrosion-resistant, and provides excellent heat dissipation.
- Low power draw: ~30mA at 5V — safe to drive directly from an Arduino digital or PWM pin.
- Wide operating range: Works from 3.0V to 5.0V DC.
🔧 How to Use
- Connect power: Positive wire to 5V DC, negative wire to ground. The laser line turns on immediately.
- Focus the line: Aim at a surface 0.5–3 meters away and gently rotate the focus ring until the line is sharp and crisp.
- Orient the line: Continue rotating the lens to change the line from horizontal to vertical (or any angle in between).
- Arduino control (optional): Connect the positive wire to a digital pin (e.g., D7) and negative to GND for programmable on/off control.
🎯 Perfect For
- Alignment & leveling — project a reference line for hanging pictures, installing shelves, tiling, or framing
- Woodworking & cutting guides — visible cut line on table saws, miter saws, and CNC machines
- 3D printer & CNC alignment — visual reference for bed leveling and work piece positioning
- Laser tripwire / security — pair with a photoresistor to detect when the line is broken across a doorway or corridor
- Stage & photography lighting — project accent lines for visual effects and set design
- Robotics — line-following reference, obstacle boundary marking, or visual feedback
- Optics experiments — demonstrate diffraction, refraction, and line projection with a cylindrical lens
- Arduino & STEM projects — teach digital output, sensor integration, and optical principles
- Industrial positioning — visual guide for material placement, conveyor alignment, or assembly fixtures
📐 Specifications
- Laser wavelength: 650nm (red)
- Optical power: ~5mW
- Laser class: Class IIIa / 3R
- Beam pattern: Line (120° fan angle)
- Operating voltage: 3.0V – 5.0V DC
- Operating current: ~30mA
- Driver circuit: Built-in (no external components needed)
- Focus: Manually adjustable (threaded lens ring)
- Line orientation: Adjustable by rotating the lens (horizontal, vertical, or any angle)
- Housing material: Chrome-plated brass
- Housing dimensions: 12mm diameter × 35mm length
- Lead length: ~135mm (5")
- Weight: 13.5g (0.5 oz)
- Case isolation: NOT isolated — case is tied to anode. Do not ground the case.
🔌 Compatible With
- Arduino Uno, Mega, Nano, Leonardo — connect directly to digital or PWM pin (~30mA draw)
- ESP32 / ESP8266 — works at 3.3V or use transistor to switch 5V for full brightness
- Raspberry Pi — use transistor/MOSFET to switch 5V from the Pi's 5V rail (do not connect directly to GPIO)
- Any 3.0V–5.0V DC source — USB power banks, USB chargers, battery packs, regulated supplies
📦 Package Contents
- 1 × 650nm 5mW Red Line Laser Diode Module with pre-wired leads
Power supply, Arduino, breadboard, and additional wiring are not included.
📊 Dot Laser vs. Line Laser — Which Do You Need?
| Feature | Dot Laser (6mm) | This Line Laser (12mm) |
|---|---|---|
| Beam pattern | Single dot | 120° line |
| Best for | Pointing, targeting, tripwires | Alignment, leveling, cutting guides |
| Housing | 6mm × 13.5mm brass | 12mm × 35mm chrome brass |
| Current draw | <40mA | ~30mA |
| Lead length | ~75mm (3") | ~135mm (5") |
| Focus | Adjustable dot size | Adjustable line sharpness + orientation |
| Case isolated? | Yes | No — case tied to anode |
👉 Need a dot laser instead? View our 650nm Red Dot Laser Module →
📄 Documentation & Resources
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