Precision Measurement: The POROMETISTO SL01 Decibel Meter delivers professional-grade accuracy 1.5dB, a wide range of 30 dB to 130 dB, and 0.1dB resolution. Its 31.5Hz to 8kHz frequency range ensures reliable data for home theaters, noisy neighbors, or workplace safety. A/C Weighting Fast/Slow Response: The SL01 sound decibel meter switches between A-weighting which mimics human hearing for ambient noise and C-weighting which analyzes machinery/audio frequencies. This noise recorder chooses Fast (125ms) for sudden noise spikes or Slow (1000ms) for stable averagesperfect for monitoring Airbnb noise complaints or industrial inspections. dB/SONE Unit Durable: The SL01 spl meter toggle between dB and SONE units, tracks Max/Min values, and the Data Hold function. Includes auto-shutdown (cancellable) and low-battery alerts. This db meter is designed for durability with a shock-resistant rubber casing and portable handheld size. Rugged Design Broad Applications: Equipped with a precision condenser microphone and windproof ball, the SL01 noise decibel reader excels in harsh environments, such as construction sites, home theaters, or neighborhood noise disputes. This sound level meter is ideal for sound engineers, landlords, professionals, DIYers, and industrial noise inspections. Complete Kit: This kit includes the SL01 Decibel Reader, 3x1.5V batteries, a screwdriver, a velvet bag, and a manual.