Multi-function display on the same screen: Capacitive microphone + high- for precision temperature and humidity sensor, accurate and reliable data Curve recording makes noise visualization: switch to curve mode, you can clearly see the noise changes in a period of time A/C dual-weighted measurement can measure more diverse environments, A/C weighting characteristics, making the measurement more professional. Real-time measurement for instant response, fast and slow time weighting, one-button switch 1.25S fast measurement, more stable, easy to obtain noise level