This CO₂ Monitor provides real-time measurement of carbon dioxide, temperature and relative humidity, featuring a three-color backlight LCD to indicate CO₂ levels at a glance.

Note: All Tongdy monitors and controls ship direct from the factory. Please allow 10-15 business days for shipping and handling.

It can optionally display 24-hour averages and maximum CO₂ values for more comprehensive tracking. A buzzer alarm can be enabled, disabled, or silenced once triggered for flexible alerting. The device offers optional on/off output to control a ventilator and an RS485 Modbus interface for system integration. It supports multiple power options, including 24VAC/VDC, 100–240VAC or USB/DC adapter, and is designed for wall-mounting (desktop version also available).

• Real-time CO₂ monitoring for accurate indoor air quality management

• NDIR infrared CO₂ sensor with self-calibration for precise and reliable readings

• Long-lasting sensor with over 10-year lifespan

• Monitors temperature and humidity alongside CO₂

• Three-color LCD backlight (Green/Yellow/Red) indicates ventilation levels at a glance

• Buzzer alarm can be enabled or disabled as needed

• Optional 24-hour average and maximum CO₂ display

• Optional relay output to control ventilation systems

• Modbus RS485 communication for system integration

• Touch-button interface for simple operation

• Multiple power options: 24VAC/VDC, 100–240VAC, or USB 5V

• Desktop version also available

Applications

• Schools, offices, hotels, meeting rooms
• Shops, restaurants, hospitals, theaters
• Air ports, train stations, other public places
• Apartments, houses
• All ventilation systems