Versatility: This digital sound level meter is ideal for measuring ambient noise in various locations such as factories, workshops, schools, residential areas, and offices. It is well-suited for acoustic engineering, quality control, and health and safety applications, helping ensure compliance with noise level standards in different environments. High precision: This sound level meter has a measurement range of 30 to 130 dB, an accuracy of ±1.5 dB at 94 dB and 1 kHz, and a display resolution of 0.1 dB. This level of precision makes it suitable for professional use and regulatory compliance. Weighted measurements: The sound level meter features a weighting filter that adjusts the response to prioritize frequencies most audible to the human ear, providing more accurate assessment of environmental noise. Fast/Slow Response Mode: Users can switch between fast and slow response settings by pressing the Mode button. FAST mode allows real-time monitoring of fluctuating noise levels, while SLOW mode delivers averaged readings ideal for stable sound environments. Advanced Features: The meter captures maximum and minimum sound levels and retains data for over 3 seconds, with a standard sampling rate of 0.5 seconds and a maximum error of 5%. The HOLD function freezes the current reading on the display for convenient analysis, and the OVER/UNDER indicator alerts the user if a measurement exceeds the operational range, ensuring data integrity. Battery: 3 x 1.5V AAA batteries (not included) Operating temperature/humidity: 0°C to 40°C / 10% to 90% RH Storage temperature/humidity: -10°C to 60°C / 10% to 75% RH Instrument size: 150 x 50 x 30 mm Note: Measurements are taken manually; please allow for a 1–3 cm variation due to lighting and display differences. Color may vary slightly depending on screen settings. Please refer to the actual product received.