Feature: 1. High‑precision carbon dioxide detector has multiple functions, can measure CO2 concentration (PPM), air temperature (℃/℉), humidity (%), atmospheric pressure (hPa, kPa, inHg, PSI), and has a perpetual calendar and time display function . 2. The LCD screen, large black fonts are clear and easy to read, just press the button on the top of the device, you can easily turn on/off the backlight, with data retention function, can maintain the current reading. 3. Every time you turn on the device, you can track the maximum and minimum values of any parameter. After you connect the device to the PC and install the software, you can start recording data. The maximum recording capacity is 9144 groups. 4. Powered by 4 1.5V AA batteries (not included), if it cannot be used, it will automatically turn off after 10 minutes, with a low battery indicator to remind you to replace the battery. 5. There are 2 installation methods. The carbon dioxide detector has two hanging holes and a folding bracket design, which is very suitable for wall hanging or placing on the table, suitable for a variety of environments, such as indoor, outdoor, office, etc. Specification: Item Type: CO2 Detector Material: ABS Carbon Dioxide Range: 0~9999 (Over Scale) Accuracy: ±50ppm of Reading ±5% (0~5000) Response Time: 10 Seconds Temperature Range: -10~70℃ (14~158℉) Resolution: 0.1℃/℉ Accuracy: ±0.6℃/℉±0.9 (0~50℃/ 32~122℉), Others ±1.2℃ Humidity Range: 0~99.9% Resolution: 0.1% Air Pressure Range: 10~1100hPa / 1~110kPa / 0.29~32.48 inHg / 0.15~16.00 psi Resolution: 1Pa / 0.1kPa / 0.01 inHg / 0.01Psi Data Record: 9144 Groups Working Conditions: 0~50℃, 0~95%RH Storage Conditions: -20~60℃, 0~99%RH Screen Size: Approx.120 x 70mm/4.7 x 2.8in Storage Box Size: Approx. 250 x 205 x 68mm/9.8 x 8.1 x 2.7in Power Supply: 4 x 1.5V AA Batteries (Battery Not Included) or the First Output 5V AC Adapter Product size: Approx. 160 x 122 x 28mm/6.3 x 4.8 x 1.1in Weight: Approx. 886g/31.3oz How to Use: Get the product, install the battery, and you can use it; the user can adjust the use of multiple functions. There are multiple buttons on the back of the product, from top to bottom; from left to right: 1. Switch Temperature Unit: ℃/℉ 2. Switch Atmospheric Pressure: hpa, kpa, inHg, PSI 3. Data Retention Button 4. Maximum/Minimum Reading Function 5. Non-Automatic Shutdown Button 6. REC Button 7. Record Button 8. Power Button This product can also be connected to the supporting 5V AC adapter for charging without installing a battery; when recording multiple data, the CD can be used, and the computer side operation is required. First use the USB data cable to connect to the computer, and the computer side needs to download and connect Timely software application can be matched with the carbon dioxide instrument, and the data can be exported after successful connection. The connection steps can refer to the manual, there are detailed operation steps. . Package List: 1 x CO2 Detector (Battery Not Included)1 x USB Data Cable1 x 5V AC Adapter1 x CD 1 x Instruction