The JRT M88B-40m laser distance sensor module is a compact, high-precision laser ranging sensor that measures distance and height from 0.03 m to 40 m with 1–2 mm accuracy.
Built around an eye-safe Class II laser diode and a digital UART-TTL or USB output, this laser distance sensor module is designed for tunnel height monitoring, underground mining safety systems, industrial automation, machine control and OEM integration where consistent millimetre-level distance data is required.
Unlike ultrasonic or mechanical measuring devices, the JRT M88B-40m uses laser-based time and phase ranging to deliver stable, drift-free distance readings over a 40-metre working range.
The sensor outputs digital data over a UART-TTL serial interface, with an optional USB variant that connects directly to a PC or laptop for configuration, testing and data logging.
Its compact 45 × 25 × 12 mm housing and 9 g weight allow it to be embedded into tight enclosures, vehicle mounts, conveyor frames and fixed monitoring stations.
Technical Specifications
| Specification | Details |
| Model Number | M88B-40m (UART-TTL) / M88B-40m USB |
| Sensor Type | Optical-electronics laser distance sensor |
| Measuring Range | 0.03m – 40m |
| Accuracy | 1mm – 2mm |
| Resolution | 1mm |
| Measuring Time | 0.4 – 4 seconds |
| Output Frequency | 3Hz |
| Laser Class | Class II (eye-safe) |
| Laser Wavelength | 620 – 690nm, <1mW output |
| Communication Interface | UART-TTL or USB |
| Electrical Level | TTL / CMOS |
| Operating Voltage | DC 2.5 – 3.3V |
| Operating Temperature | 0°C to 40°C |
| Storage Temperature | −25°C to 60°C |
| Dimensions | 45 × 25 × 12mm (±1mm) |
| Weight | Approx. 9g |
| Condition | New |
Key Features of the JRT M88B Laser Distance Sensor
40m Long-Range Laser Distance Measurement
- Measuring range of 0.03 m to 40 m for short and long-distance detection
- Stable readings on most matte, reflective and painted surfaces
- Measuring cycle of 0.4–4 seconds depending on target distance and light conditions
High-Precision 1mm–2mm Accuracy
- Accuracy of 1–2 mm (0.04 inch) with 1 mm resolution
- Suitable for critical applications requiring consistent, repeatable results
- 3 Hz output frequency for near real-time distance feedback
Eye-Safe Class II Laser
- Class II laser with 620–690 nm visible red wavelength
- Output power under 1 mW for safe continuous operation
- Visible aiming beam simplifies target alignment
UART-TTL and USB Interface Options
- UART-TTL model for direct integration with microcontrollers, PLCs and embedded control systems
- USB model for plug-and-play connection to a PC or laptop for setup, testing and data logging
- TTL/CMOS electrical levels for straightforward wiring to common development boards
Compact, Lightweight Housing
- Compact 45 × 25 × 12 mm (±1 mm) housing
- Lightweight at approximately 9 g for easy mounting in tight or mobile setups
- Operating temperature range of 0°C to 40°C, storage −25°C to 60°C
Applications & Use Cases
Tunnel Height & Underground Mining
The JRT M88B-40m is well suited to tunnel clearance monitoring, coal and underground mine safety systems, and shaft or stope distance checks where a compact, rugged laser distance sensor module is needed.
Industrial Automation & Machine Control
Use the UART-TTL output for conveyor level monitoring, stockpile and silo distance measurement, forklift and vehicle height detection, and general position feedback in automated machinery.
Robotics, AGV & Embedded Projects
The digital serial output integrates easily with microcontrollers and single-board computers for AGV navigation, robotics ranging, and DIY or OEM measurement projects. The USB variant is ideal for bench testing and rapid prototyping before committing to a TTL embedded design.
Why Choose the JRT M88B-40m Laser Distance Sensor Module?
The JRT M88B-40m combines a 40-metre measuring range, 1–2mm accuracy, an eye-safe Class II laser and a choice of UART-TTL or USB output in one compact, lightweight module.
It is a practical laser distance sensor module for engineers and integrators who need dependable millimetre-level distance data for tunnel, mining, industrial and robotics applications
Frequently Asked Questions
What is the measuring range of the JRT M88B-40m laser distance sensor module?
The JRT M88B-40m measures distance from 0.03m up to 40m, with actual maximum range depending on target reflectivity, surface angle and ambient light conditions.
What is the difference between the TTL and USB versions?
The M88B-40m (UART-TTL) outputs distance data directly over a TTL serial interface for integration with microcontrollers, PLCs and embedded systems. The M88B-40m USB version adds a USB-to-serial interface for direct connection to a PC or laptop, making it easier to configure, test and log data before deployment.
How accurate is this laser distance sensor?
The sensor delivers 1mm to 2mm accuracy with 1mm resolution, suitable for applications that require consistent, repeatable distance measurements.
Is the laser in this sensor safe to use?
Yes. The JRT M88B-40m uses a Class II laser with a 620–690nm wavelength and output power under 1mW, which is classified as eye-safe under normal operating conditions.
Can this sensor be used in coal mines and tunnels?
Yes. Its compact housing, UART-TTL/USB digital output and 40m range make it suitable for tunnel height clearance monitoring and underground mining distance-measurement systems.
What controllers or systems is the JRT M88B-40m compatible with?
The UART-TTL model works with any microcontroller or system that supports TTL serial communication, including Arduino, STM32 and PLC serial modules. The USB model connects directly to a Windows PC or laptop.
