This RS485 Formaldehyde Temperature and Humidity Transmitter is equipped with a high-precision electrochemical sensor, supporting the monitoring of formaldehyde concentration (0-5ppm), temperature (-40℃~+80℃), and humidity (0~100% RH). With a resolution of 0.01ppm, it boasts high measurement accuracy and rapid response. Adopting the ModBus-RTU protocol, the device offers a maximum communication distance of 2000 meters and features a wide DC voltage supply range (10-30V) for multi-scenario adaptation. Its waterproof wall-mounted design enables easy installation, and an optional OLED display is available. Supporting 24/7 continuous online monitoring, it is widely applicable in industrial environments, air purification equipment, and other scenarios.