High-Precision NDIR Sensor for Accurate CO2 Detection

This indoor air quality monitor uses a professional NDIR (Non-Dispersive Infrared) CO2 sensor to measure carbon dioxide levels from 400 to 5000ppm with an accuracy of ±50ppm + 5%. Unlike cheap TVOC sensors, NDIR technology provides stable, long-term accuracy without frequent calibration—simply press all three buttons simultaneously in an open environment to calibrate to outdoor baseline (∼500ppm) within 200 seconds. Whether you're concerned about stuffy bedrooms, crowded offices, or monitoring CO2 levels in a grow tent or wine cellar, this detector gives you reliable readings you can trust.
PTH-9C Feature

3-in-1 Environmental Monitor: CO2, Temperature & Humidity

Get a complete picture of your indoor air quality at a glance. The large LCD screen clearly displays three key parameters simultaneously: real-time CO2 concentration (ppm), current temperature (selectable °C/°F), and relative humidity (%RH). This all-in-one design saves counter space and eliminates the need for separate thermometers and hygrometers—perfect for maintaining optimal comfort and health in any room.

Smart 3-Color Visual Alarms & Customizable Alert

Know exactly when it's time to open a window. The PTH-9C features a 3-color smart alarm system that provides instant visual feedback: green (400-700ppm, normal air quality), yellow (700-1500ppm, warning—ventilation recommended), and red (1500-5000ppm, dangerous—immediate ventilation required). You can also customize the alarm threshold to your preference. Studies show that CO2 levels above 1000ppm can cause headaches, fatigue, and reduced concentration—this detector helps you stay alert and healthy.

2400mAh Rechargeable Battery & Plug-and-Play TYPE-

Ready to use right out of the box with no WiFi setup or complicated apps required. The built-in 2400mAh lithium battery provides up to 24 hours of standby operation, and you can keep the device running continuously by plugging it into any YPE-C charger. The compact, portable design fits easily on a desk, nightstand, or bookshelf, and includes a hanging hole on the back for wall mounting. Simply charge, turn on, and start monitoring—no internet, no subscription, no hassle.

Perfect for Home, Bedroom, Office & Travel

Versatile protection for every enclosed space you care about. Use it in your bedroom to monitor overnight CO2 buildup, in your home office to maintain focus during long workdays, in your child's nursery for healthy air, or take it on trips to check hotel room air quality. Ideal applications include: home, bedroom, office, car, classroom, grow tent, wine cellar, and RV. Breathe easier knowing exactly what's in the air—anywhere, anytime.