1. Choose the appropriate formaldehyde detection instrument: There are a variety of formaldehyde detection instruments on the market, such as electrochemical sensors, ultraviolet absorption methods, infrared absorption methods, etc. Choosing the right instrument can improve the accuracy of your test. 2. Prepare the test environment: Before testing, you need to close doors and windows, turn off equipment such as air purifiers and air conditioners, and keep the indoor air in a static state. At the same time, you need to wait for at least 30 minutes to allow the indoor air to fully stabilize. 3. Place the formaldehyde detection instrument: Place the formaldehyde detection instrument in a location with indoor air circulation, such as the living room, bedroom, etc. At the same time, it is necessary to avoid placing the instrument in direct sunlight to avoid affecting the test results. 4. Test time: The test time is generally 30 minutes to 2 hours, and the specific time depends on the requirements of the instrument. During the test, it is necessary to maintain a stable indoor environment and avoid personnel entry and exit and other interference. 5. Read the test results: After the test, read the test results according to the instructions of the instrument. If the formaldehyde concentration exceeds the national standard, corresponding measures need to be taken, such as ventilation and the use of air purifiers. It should be noted that measuring formaldehyde by yourself can only be used as a preliminary reference. If you need more accurate test results, it is recommended to ask a professional organization for testing.