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    INKBIRD Air Quality Monitor PTH-9A
    Air Detector PTH-9A with Six Metrics - AQI, CO2, Temp, Humidity, PM2.5, and PM10
    Air Quality Monitor PTH-9A with Functions
    Digital CO2 Detector PTH-9A with AQI Alarm Function
    Convenient USB Charging PTH-9A
    PTH-9A 3 Stages of AQI Concentration
    Calibration Function PTH-9A
    Digital 6-in-1 CO2 Detector PTH-9A Dimension Overview
    PTH-9A Air Quality Monitor for Indoor, Office, Car, and Grow Tent

    INKBIRD

    Digital 6-in-1 CO2 Detector PTH-9A

    Sale price$89.99Regular price $119.00
    Plug Type
    Plug Type: US
    Free Shipping
    30-Day Easy Return
    1-Year Warranty
    Key Features
    • 6-in-1 Air Quality Monitor: Tracks CO₂, PM2.5, PM10, AQI, temp, and humidity
    • Three-Stage AQI Indicator: Normal (0–50), warning (51–100), danger (101–500)
    • AQI Sound Alarm: Alerts when air quality reaches dangerous levels
    • Auto CO₂ Calibration: Self‑adjusting for consistent accuracy
    • USB Rechargeable Convenience: 2400mAh built‑in battery
    • Portable & Versatile: Works in bedrooms, kitchens, cars, grow tents, and more
    Highlights
    Specs
    FAQ
    Reviews
     

    6-in-1 Indoor Air Quality Monitor

    With advanced sensors, the PTH-9A can accurately detect the current levels of CO2 concentration, PM2.5, PM10, AQI, temperature, and humidity.

    Three-Stage AQI Indication and Sound Alarm

    The air quality detector features three AQI levels - normal (0-50), warning (51-100), and danger (101-500). Should the AQI exceed 100, it will trigger a clear sound alarm.

    Automatic CO2 Calibration Function

    To easily calibrate the CO2 detector, simultaneously press and hold all three buttons in a well-ventilated area after shutdown, and let it stand for 200 seconds.

    Color LED Screen with Time/Date/Year

    Beyond air quality monitoring, the color LED screen also displays current time, date, and year. Plus, it can switch between Celsius and Fahrenheit for temperature readings.

    Rechargeable and Portable Design

    The air quality monitor comes with a 2400mAh rechargeable battery and a convenient hook on the back, perfect for anywhere you need it.

    Product Overview

     

    Specs

    Model:

    PTH-9A

    Dimension:
    5.5 x 3.9 x 2 inches / 14 x 10 x 5 cm
    Weight:
    12.7 oz / 360g
    Input Power:
    5V 1A
    Battery:
    Built-in 2400mAh Lithium Ion Battery
    Screen:
    Backlight LED
    CO2 Range:
    400-5000ppm
    Temp Range:
    14~104℉/ -10~40℃
    Humidity Range:
    20-80%RH
    PM2.5:
    0 ~ 1000 μg/m³（±10%）
    PM10:
    0 ~ 1000 μg/m³（±10%）
    Package Content:

    CO2 Detector PTH-9A *1, User Manual *1, USB Charging Cable *1

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    Compare with Others

    Appearance:

    		 INKBIRD Air Quality Monitor PTH-9A Digital 3 - in - 1 CO2 Detector PTH - 9C - INKBIRD Wireless 4 - in - 1 Air Quality Monitor IAM - T1 - INKBIRD Wireless 10 - in - 1 Air Quality Monitor IAQM - 129 - W - INKBIRD
    Model:

    PTH-9A

    PTH-9C

    IAM-T1

    IAQM-129-W
    WiFi: x x x 2.4GHz
    Bluetooth: x x Bluetooth 5.0 x
    Data Detection: CO2, Temperature, Humidity, PM2.5, PM10, AQI CO2, Temperature, Humidity CO2, Temperature, Humidity Temperature, Humidity, CO2, TVOC, HCHO, AQI, PM2.5, PM10
    Time:Screen: √ x x √
    Battery:Alarm: Backlight LED Backlight LED Electronic ink display VA
    CO2 Indicator: Built-in 2400mAh Built-in 2400mAh 2x AA batteries Built-in 2700mAh
    Alert Value: Only sound Only sound Only sound Sound and light
    CO2 Range: √ √ √ √
    CO2 Calibration: When CO2 exceeds 1000PPM Custom alert values Custom alert values Custom alert values
    Temperature Range: 400~5000PPM 400~5000PPM 0~9999PPM 400~5000PPM
    Humidity Range:

    		 √ √ √ √
     

    Frequently Asked Questions

    How to set time, date and year on PTH-9A?

    Double-click the circle button at the top to enter setting mode, and then you'll go through the settings in this order: year, data, and time. Use the minus button to decrease the value and the plus button to increase. After each item is set, press the circle button to confirm and enter the next setting.

    How to stop the sound alarm?

    When the AQI exceeds 100 and the buzzer is on, the PTH-9A will sound an alarm. To silence it, just long press the plus button at the top.

    How long does the PTH-9A's battery last on a full charge?

    The battery life of this CO2 detector can vary based on usage, but it generally lasts 10-15 hours on a full charge. Since it contains 6 sensors, it is recommended to keep it plugged in while in use.

    Is the PTH-9A suitable for outdoor use?

    While PTH-9A can measure outdoor air quality, we do not recommend using it outdoors, especially in harsh weather. Prolonged exposure to rain, direct sunlight, or extreme temperatures could impact its performance and accuracy.