Features: Multi functional formaldehyde detector with integrated TVOC, temperature, and humidity monitoring delivers rapid <0.3mg/m³ resolution and air quality surveillances through advanced electrochemical sensors technology. Features circulation vents for 20% faster airflows sampling, customizable backlit LCD display, and AI powered double alarm systems (visual LED indicators + 85dB buzzer) triggered at ≥1mg/m³ formaldehyde or ≥0.6mg/m³ TVOC concentrations. Essential for homeowners, renters, and office managers requiring professional indoor air quality monitoring without laboratory equipment costs. Ideal for post renovation safety checks, HVAC systems evaluations, and school environment assessments with continuous 0.01mg/m³ sensitivity across 0 5mg/m³ detection ranges. Engineered with MIL STD 810G shock resistant housing and ±5% measurement accuracy, this portable air quality sensors combines laboratory accuracy with consumer friendly operate through auto calibration technology. Specifications: Component : plastic Size: about 160x55x20mm/6.3x2.2x0.8inch Detection ranges: 0~1.999mg/m² (formaldehyde) 0~9.999mg/m² (TVoC) -10~50°C (temperature) 10~99% (humidity) Package Includes: 1xFormaldehyde Meter note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.