1.28-inch color LCD (320 × 240 pixels) for clear, easy-to-read measurements User-adjustable O3 alarm threshold lets you set the trigger point for alerts when ozone (O3) concentrations rise. Handheld, compact design: small, lightweight housing that is easy to carry and use for spot checks or continuous monitoring. Designed to detect residual ozone in offices, indoor and outdoor spaces, and after disinfection procedures. Built-in 2000 mAh lithium battery with USB charging and low-battery warning for reliable, portable operation. Key benefits Immediate safety information: the color LCD and user-set alarm deliver fast, visible alerts so you can respond quickly to elevated ozone levels. Portable and convenient: compact form factor and USB charging make it simple to take measurements anywhere—no fixed installation required. Practical for post-disinfection checks: confirm residual ozone levels after cleaning or sterilization to protect occupants and meet safety protocols. Dependable runtime: the 2000 mAh battery supports extended use between charges and warns you when recharge is needed. How it solves problems Reduces uncertainty after disinfection by providing a direct measurement of residual ozone. Enables on-the-spot verification of air quality in workplaces, public areas, and outdoor locations without bulky equipment. Custom alarm thresholds let you match alerts to your safety policies or regulatory limits. Typical use scenarios Facility managers performing post-disinfection checks in offices or healthcare settings to verify safe re-entry. Building maintenance or safety officers assessing indoor and outdoor ozone levels near HVAC systems or treatment areas. On-site inspections after ozone-based cleaning or sterilization to confirm residual ozone has returned to acceptable levels. Specifications and functions Display: 1.28-inch color LCD, 320 × 240 pixels Alarm: user-adjustable O3 threshold Form factor: handheld, compact housing Battery: 2000 mAh lithium battery, USB charging, low-battery warning Practical, portable, and easy to use—designed to give clear ozone readings and timely alerts whenever and wherever you need them.