How do you feel about using the Yiyuntian four-in-one gas detector? Do you know?

My experience is that the Yiyuntian four-in-one gas detector is a very good product and feels good to use. Yiyuntian was founded in 2006. For more than ten years, it has focused on the research and development of products and solutions such as gas detection, alarms, and monitoring pretreatment. It takes its portable four-in-one gas detector MS400-4 as an example. MS400-4 can detect four types of gas detectors. Gases include CO, H2S, O2, and Ex. It is mainly used for portable and rapid detection of various gas concentrations, temperature and humidity measurements, and excessive alarms. It basically covers most detection needs.