Professional-grade noise meter | High-precision decibel meter (30–130 dB) | Handheld sound level meter and noise detector

I. Product Overview
The BAOLIAN BL-72A Professional-Grade Sound Level Meter is a high-precision, handheld decibel meter designed specifically for the accurate measurement of environmental noise. Whether you need to measure noise in the home, the acoustic environment of an office, the operating noise of equipment in an industrial workshop, or urban traffic noise, the BL-72A provides fast, accurate and reliable measurement data.

The BL-72A features a capacitive microphone and a metal vented design, with a built-in high-precision sensor and dual internal and external protection, ensuring safe, non-destructive and highly accurate measurements. With a measurement range spanning 30 dBA to 130 dBA and an accuracy of ±1.5 dBA, it is suitable for all scenarios, from everyday domestic use to industrial-grade noise monitoring.

II. Six Major Advantages
1. Condenser Microphone · Precise Sound Capture
Equipped with a high-sensitivity condenser microphone sensor and a metal vented design, featuring dual internal and external protection, it accurately captures sound signals for more reliable, non-destructive measurements.

2. Wide Range and High Accuracy · 30–130 dBA
With a measurement range spanning 30 dBA to 130 dBA and an accuracy of up to ±1.5 dBA, it can accurately measure everything from a whisper to industrial noise.

3. Backlit Large Display · No Fear of Darkness
Equipped with a backlit display, the text is clearly visible and the response is sensitive, allowing data to be read easily even at night or in dimly lit environments.

4. Data Hold · One-Button Lock
Simply press the ‘HOLD’ button to lock the current measurement value; press it again to resume normal operation, facilitating recording and comparison.

5. Fast Response · Real-time Measurement
Supports rapid sampling at 2 times per second, displaying test results quickly and accurately to capture dynamic noise changes.

6. Intelligent Power Saving · Automatic Shutdown
Press the power button briefly to switch on; the device automatically shuts down after approximately 10 minutes of inactivity, saving energy and extending battery life.

III. Technical Specifications
Parameter    Specifications
Product Model    BAOLIAN BL-72A
Measurement Range    30 dBA to 130 dBA
Measurement Accuracy    ±1.5 dBA
Microphone Type    Condenser microphone (with windscreen)
Frequency Weighting    A-weighted mode (matches human hearing characteristics)
Response Mode    Selectable: Fast response / Slow response
Sampling Rate    2 times per second
Display Type    Backlit LCD display
Data Hold    One-touch ‘HOLD’ lock
Peak Value Recording    MAX peak value recording
Auto Power-off    Automatic power-off after 10 minutes of inactivity
Power Supply    Battery-powered (low battery warning)
Dimensions    160 mm × 46 mm
Windscreen    Foam windscreen (to prevent wind noise interference during outdoor measurements)

IV. Common Noise Level Reference
To help you quickly understand the meaning of the measurement values:
Decibel Range    Perceptual Description
0–20 dB    Very quiet, barely perceptible
20–40 dB    Quiet, like a soft murmur
40–60 dB    Normal, typical indoor conversation level
60–70 dB    Noisy, harmful to the nerves
70–90 dB    Very noisy, nerve cells are damaged
90–100 dB    Intense noise; hearing damage
100–120 dB    Unbearable; exposure for one minute causes temporary deafness
Above 120 dB    Severe or total deafness
V. Applications
The BL-72A mini sound level metre offers multi-directional noise measurement and stable performance, making it suitable for a wide range of noise detection scenarios:

🏠 Domestic environments
Monitoring sleep noise in bedrooms
Detecting noise from operating household appliances (air conditioners, fridges, washing machines, etc.)
Gathering evidence for neighbourhood noise complaints

🏢 Offices and study areas
Assessing office noise levels
Maintaining quiet environments in libraries and classrooms
Testing the acoustic environment in meeting rooms

🏭 Industry and commerce
Monitoring noise from operating equipment in factory workshops
Workplace safety compliance checks
Noise control in shopping centres and warehouse areas

🚗 Transport and Urban Areas
Urban environmental noise detection
Car/vehicle noise detection
Noise detection in stairwells and residential communities

🏗️ Construction Sites
Real-time noise monitoring at construction sites
Ensuring construction noise complies with environmental standards

🎵 Entertainment and Audio
Audio system calibration
Music recording environment assessment
Decibel measurement at public events

VI. User Guide (How to Use)
Power on: Press the power button briefly to switch on
Mode selection: Select A-weighted mode (matches human hearing) or fast/slow response mode according to measurement requirements
Measurement: Point the microphone at the sound source to read decibel values in real time
Data hold: Press the ‘HOLD’ button lightly to lock the current reading
Peak value recording: Press the ‘MAX’ button to record the highest decibel value during measurement
Auto-shutdown: The device automatically switches off after 10 minutes of inactivity to save energy

VII. Why Choose the BAOLIAN BL-72A?
✅ Professional-grade quality — Industrial-grade design, stable and reliable performance
✅ Precise measurement — Capacitive microphone + high-precision sensor, ±1.5 dBA accuracy
✅ Portable and user-friendly — Compact, handheld design, operable with one hand
✅ Multi-functional integration — Data hold, peak value recording, fast/slow response modes, backlit display
✅ Wind-resistant design — Foam windscreen ensures outdoor measurements are free from wind noise interference
✅ Long battery life — Energy-saving auto-shutdown design with low battery warning

Package Contents
BL-72A Sound Level Meter × 1
Foam windscreen × 1
User manual × 1