ATP MT-911A Mini Sound Level Meter
The ATP MT-911A Mini Sound Level Meter gives quick and clear sound readings in a compact body. It also measures ambient temperature, so you can check noise and conditions at the same time. This makes it ideal for routine site checks, workshops and shared work areas.
With a fixed A weighting, the ATP MT-911A supports environmental noise checks with confidence. You can switch between Fast and Slow time weighting to suit changing or steady sound levels. In addition, the meter delivers 0.1 dB resolution across a 35 to 135 dB range for detailed results.
Clear Display and Simple Control
The bright colour LCD shows large digits and clear icons for easy reading in low light. Updates run at around every 300 ms, so you can follow sound changes in real time. Data hold lets you freeze values, while the min and max function records the highest and lowest readings during a test.
Portable for Daily Surveys
Light weight and small size allow the ATP MT-911A to fit easily in a pocket or tool bag. A wind muffler helps reduce gust noise when working outdoors or near vents. Auto power off saves battery life after around 15 minutes of no use, and you can disable this function if required.
The ATP MT-911A Mini Sound Level Meter comes ready to use with batteries included. It operates from three AAA alkaline cells and provides clear low battery warning on screen. As a result, you can start checks straight away and plan battery changes with ease.
Key Features
- Measures sound level and ambient temperature in one device
- Compact and lightweight design for mobile use
- Fixed A weighting for environmental noise checks
- Selectable Fast and Slow time weighting
- Clear colour LCD with large digit display
- Backlit screen for low light work areas
- Data hold function to freeze readings
- Minimum and maximum value capture during tests
- Wind muffler supplied for outdoor measurements
- Low battery indicator for planned maintenance
- User selectable auto power off function
Technical Specifications
| Manufacturer | ATP |
| Manufacturer part code | MT-911A |
| Measurement functions | Sound level in dB with A weighting and ambient temperature |
| Sound level range | 35 to 135 dB |
| Sound level resolution | 0.1 dB |
| Sound level accuracy | ±2 dB at 94 dB, 1 kHz |
| Frequency range | 31.5 Hz to 8 kHz |
| Frequency weighting | A weighting fixed |
| Time weighting | Fast and Slow |
| Display size | 30 mm colour LCD with function indicators |
| Update rate | Approximately every 300 ms |
| Backlight | Yes |
| Auto power off | After approximately 15 minutes of inactivity, user can disable |
| Operating temperature range | -20 °C to +70 °C |
| Temperature resolution | 0.1 °C |
| Temperature accuracy | ±1.5 °C |
| Calibration certificate | Issued at 94 dB and 104 dB on A and C, Fast and Slow, High and Low |
| Power supply | 3 x 1.5 V AAA alkaline batteries LR-3-3 |
| Dimensions | 144 x 56 x 31 mm |
| Weight | 73 g |
What’s Included
- ATP MT-911A Mini Sound Level Meter
- Wind muffler
- AAA alkaline batteries x3
