FNIRSI FDM01 High-precision Digital Noise Decibel Meter

The FNIRSI FDM01 is a compact decibel meter that combines the function of measuring noise between 30-130 dB with simultaneous monitoring of temperature and humidity. The device has a sensitive condenser microphone, a 2.3" VA color display with backlight and a rechargeable lithium battery (600 mAh) charged via USB-C. With its fast response time, MIN/AVG/MAX measurement modes, light indication and two sensing modes (FAST/SLOW), the FDM01 FNIRSI is useful in the office, construction site, transportation, production halls and public spaces.
The used 6 mm condenser microphone is characterized by high sensitivity and fast response time. The use of nickel-plated steel, a three-layer conductor structure and silicone seals effectively isolates interference and ensures reliable results even in the event of sudden volume spikes. The FNIRSI FDM01 decibel meter allows you to choose between fast (1 sec) and slow (1.25 sec) measurement modes. This way, you can choose how to record data in dynamically changing conditions, or get a more stable result in the case of fixed noise sources.
The device uses the A-weighting characteristic, which corresponds to the sensitivity of the human ear to different frequencies. The measurement takes place in the 31.5 Hz - 8.5 kHz range, which enables a reliable assessment of environmental noise levels in accordance with standards.
The FDM01 indicates with a red alarm light if the set sound threshold is exceeded. It is also possible to display only the minimum, average or maximum value, making it easier to document the results. The "HOLD" function allows you to keep the current value on the screen.
The 2.3-inch VA display displays all data clearly even in a bright environment. The ABS plastic housing and silicone buttons increase the durability of the device in field and industrial conditions. The soft windshield design reduces the impact of environmental noise on the measurement. The 600 mAh lithium battery eliminates the need for batteries. The device is charged via a USB-C port, which simplifies operation and reduces the cost of ownership.

- Model FDM01
- Accuracy ±1.5 dB (based on 94 dB @ 1 kHz NV sound source)
- Frequency range 31.5 Hz 8.5 kHz
- Dynamic range 3.50 dB
- Measuring range 30-130 dB
- Frequency weighting characteristics The curve
- Digital display 4 digits, resolution 0.1 dB, reading frequency 2 times/sec.
- Dynamic scale (display) 1 division = 2 dB, reading frequency 2 times/sec.
- Dynamic scale range 30-130 dB
- Overload indication "OVER" or "UNDER" symbol
- Dynamic characteristics FAST (fast), SLOW (slow)
- Microphone 6 mm condenser microphone
- Keep the maximum value MAX
- Rechargeable battery 600 mAh / 3.7 V (rechargeable lithium battery)
- Operating temperature and humidity 0°C 40°C, 10 % 80 % RH
- Storage temperature and humidity -10°C 60°C, 10% 70% RH