Decibel Meter - Noise Detector

Welcome to the "Pro Decibel Meter & Noise Tracker" developed by WantJTech, designed specifically for environmental monitoring and hearing protection. Whether you are an engineer conducting industrial safety checks or a regular user measuring noise in your neighborhood, this app provides the most intuitive and seamless sound measuring experience.

【Core Features】

📊 Sci-Fi Neon Dashboard
Say goodbye to boring plain text! Our exclusive "War Room" style ring dashboard features real-time color transitions based on decibel levels (Safe Green ➔ Warning Yellow ➔ Danger Red), allowing you to grasp the current noise danger level at a single glance.

🚨 2σ Anomaly Detection
Introducing professional-grade statistical analysis! The system automatically calculates the normal distribution of environmental noise and accurately marks extreme volume levels that exceed "2 standard deviations (2σ)". This helps you filter out background noise and instantly catch sudden, abnormal loud noises, making it an excellent data analysis tool for factory monitoring and field operations.

📈 Dynamic History Chart
Fully record the noise fluctuations! The line chart dynamically renders seamless color gradients based on decibel levels and simultaneously displays your custom red dashed alarm line, making it easy to read noise peaks and trends.

🎛️ Pro Hardware Calibration
Microphone sensitivity varies across different smartphone brands. We provide a professional "Manual Calibration" feature. You can adjust the dB offset value according to standard instruments, instantly turning your phone into a highly accurate sound level meter.

🏢 Environment Reference Guide
Built-in standard noise level references. As the decibels fluctuate, the system displays the corresponding environmental scenario in real-time (e.g., quiet library, normal street traffic, dangerous factory machinery), giving abstract data practical meaning.

🌍 Multilingual & Ad-Free Experience
Supports 5 languages: English, Traditional Chinese, Japanese, Korean, and Spanish, with seamless one-tap switching. We promise a completely ad-free, clean interface so you can focus on your measurement tasks without interruptions.

🚀 PRO Advanced Features
Upgrade now to unlock two powerful professional tools:

Exclusive Hz Filter: Includes presets for Human Voice, Engine, and Alarm, plus a "Custom Hz Range" to precisely isolate unwanted background noise and capture only the sounds you care about!

Professional PDF Trend Report Export: Fully includes minute-by-minute charts, hardware calibration values, and device model tags, making your data highly reliable for any environmental analysis.

【Use Cases】
• Equipment noise monitoring in factories and server rooms.
• Measuring noise in home environments or from neighbors.
• Assessing quietness in offices and libraries.
• Hearing protection alerts at concerts and construction sites.

【Disclaimer】
This application uses your mobile device's built-in microphone to measure sound. Due to hardware specifications and microphone sensitivity limitations across different phone brands, the measured values may vary slightly from professional precision decibel meters. The data provided by this app is for daily reference only and does not carry any legal, medical, or official testing validity.