Product Description 1 Formaldehyde Sensor Module MQ138 Enhanced Sensitivity and Accuracy: The MQ138 sensor module is designed for the accurate detection of various harmful gases, making it an essential tool for environmental monitoring and industrial safety applications. Easy Integration and Operation: The MQ138 module is designed for ease of use, requiring minimal installation for easy integration into existing systems, enabling seamless operation and real-time monitoring. Durable and Reliable: The MQ138 sensor module is durable and features a robust design that withstands harsh environments, ensuring long-term reliability and performance stability. Please note: Actual color or color difference does not affect use, thank you! Color: As shown in the picture. Material: Plastic + Metal. Package Contents: 1 * Formaldehyde Sensor Module