it is portable,along with a comfortable hand grip, allows you to carry the Handheld Oxygen Detector wherever needed with ease. The simple and intuitive operation interface and clear button settings effortless for even novice users to get started. Just turn it on and measuring, with real-time display of oxygen concentration,temperature, humidity, enabling you to stay informed of the environmental conditions at all times. It is a handheld Oxygen Detector,equipped with advanced sensor technology, precisely measure the oxygen content in the environment within a wide range. When the oxygen concentration is below the safety range you set, it sound an alarm to remind you to take corresponding safety measures, Manufacturer: Akfldms