Key benefits Monitors residual ozone with a user adjustable alarm threshold to alert you when concentrations become elevated. Handheld and compact design for easy, portable measurement any time and anywhere. Suitable for offices, indoor and outdoor environments, and after disinfection processes that involve ozone. 2000mAh capacity lithium battery with USB charging and a low battery warning to keep you informed. What you get and how it helps Clear viewing: 1.28inch color LCD with 320x240 pixels for easy reading of readings and status. Quick notification: adjustable O3 alarm threshold lets you set the alert level that matches your safety requirements. Convenient power: long lasting USBrechargeable battery minimizes interruptions during field use. Simple form factor: handheld, compact body designed for onehanded operation and portability. Key specifications Display: 1.28inch color LCD, 320x240 pixels Alarm: user adjustable O3 threshold Battery: 2000mAh lithium with USB charging Alerts: low battery warning Form factor: handheld, compact body Application: detection of residual ozone in offices, indoors and outdoors, and after disinfection Recommended use scenarios After ozone disinfection in offices or workspaces: verify residual ozone levels are within safe limits before reentry. Indoor environments such as homes, clinics, or laboratories: monitor ozone presence after processing or air treatment. Outdoor or mixed environments: measure residual ozone during or after outdoor disinfection or ozonerelated activities, ensuring safe exposure levels. Notes This device emphasizes function, portability, and reliability, aligning with professional use in offices, indoor and outdoor spaces, and postdisinfection monitoring.