Indoor Air Quality Monitor - Formaldehyde Detector TVOC/Indoor Temperature/Humidity with Audible Alarm, Backlit Display

5-in-1 Multifunctional Air Quality Monitor: This air quality monitor uses high-precision, professional sensors to accurately detect formaldehyde (HCHO), volatile organic compounds (TVOC), carbon dioxide (CO2), temperature (℃/℉), and humidity (%), giving you a comprehensive understanding of the air quality. This portable indoor air quality monitor can help you monitor the air quality not only in your homes, kitchens, and bedrooms, but also in schools, offices, cars, hotels, and more. HD Screen with Backlight: The air quality monitor features a high-definition LCD screen with blue backlighting. Data is clearly displayed and easy to read, allowing you to assess air quality at a glance. Accurate Measurement and Ventilation Design: The CO2 monitor has a built-in advanced digital sensor with fast response time and high sensitivity. The integrated high-performance chip can quickly process data acquired by the sensor and calculate the concentration of various gases in complex environments, producing accurate measurement results. The innovative design with ventilation allows for complete contact between the air and the sensor, making the measurement data more precise and reliable. Audible alarm: When the air pollution level is too high, the indoor air quality monitor will display "Bad" and automatically sound an alarm via the built-in buzzer to alert you. [Highlighting the maximum value and a 120-second countdown] The CO2 detector is equipped with a MAX button, allowing you to check the maximum value of the detected data in the current test record after power-up or calibration. After power-up, the CO2 meter's display counts down 120 seconds before entering test mode. During the countdown, the indoor air quality meters can be placed in a well-ventilated area to improve the accuracy of the test data.