FDM01 digital noise meter accuracy measurement: The FDM01 delivers reliable readings from 30 to 130 dB with ±1.5 dB accuracy, helping you assess sound levels in environments such as residences, construction sites, and public venues. Clear LCD readout: Large 4digit LCD display with 0.1 dB resolution and a dynamic scale makes it easy to track noise changes in real time. Overload and Under indicators provide clear status alerts. Versatile frequency range: Measures 31.5 Hz to 8.5 kHz with A weighting to reflect human ear sensitivity. Includes both FAST and SLOW response modes to suit different noise detection needs. Builtin power: 600 mAh rechargeable lithium battery enables portable, longlasting operation for extended field inspections without frequent charging. Use scenarios Monitor noise during home renovations or in residential settings to ensure levels stay within acceptable limits and protect occupants. Inspect construction sites to assess worker exposure and verify compliance with local noise regulations. Manage sound levels at public venues or events to keep crowd noise within desired thresholds and maintain a comfortable environment.