Sound & Visual Alerts: Customizable humidity thresholds double stage alarms with sound and light Color coded backlight ( red / yellow / green) instantly shows dry / moderate / wet levels for easy interpretation High Precisions Measurement: a wide ranges of 0.1% ~99.9% with ±2.5% accuracy Works on wood, paper, cardboard, cement, and plaster, ensuring clear readings for furniture and wall inspections Not Destructive Detections: Features a spherical sensors probe for pinless measurement, detecting in wall, ceilings, and floors without drilling Measures depths of 5~40mm, ideal for locating hidden leaks without damaging surfaces Smart &: Auto calibration on startup eliminates environmental errors Includes data hold, low battery warning, auto off, and built in flashlight for efficient use in dim spaces Compact & Portable: Pen styles design ( 220×40×31mm, 120g) provides a nonslip grip Battery powered for easy use in construction, home inspections, and furniture testing, Manufacturer: RGYBAO