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 perfectly suited for acoustic engineering, quality control and health prevention applications, ensuring 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 plus or minus 1.5 dB at 94 dB and 1 kHz and a display resolution of 0.1 dB. This precision makes it suitable for professional environments and compliance with regulations. Weighted measurements: The sound level meter is equipped with a weighting filter that automatically adjusts its display range to prioritize the frequencies most easily heard by the human ear. This feature is essential for accurate assessment of ambient noise. Fast/Slow Response Mode: Users can switch between fast and slow response speeds by simply pressing the Mode button. FAST mode is suitable for real-time monitoring of noise level changes, while SLOW mode provides average readings suitable for stable sound environments. Advanced Features: The sound level meter captures maximum and minimum sound levels and stores the data for more than 3 seconds with a standard sampling rate of 0.5 seconds and a maximum error of 5%. The HOLD function freezes readings on the screen for further analysis, and the OVER/UNDER indicator sounds an alarm if a reading falls outside the measurement range, ensuring that all data collected is within operating limits. Battery: 3 x 15V AAA AA batteries (not included) Operating temperature/humidity: 0~40/10~90%RH. Storage temperature/humidity: -10~60/10~75%RH. Instrument size: 150*50*30mm Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.