Usage Tips:Specification Product nameOzone Meter FunctionDetect O3/Ozone/Ozono/Ozon/Temperature/Humidity Display method2.8 LCD screen display, 320 x 240 pixels Sampling time1.5 seconds Power sourceLithium polymer battery with 2000 mAh capacity Detect gas:Ozone/Ozono/Ozon(O3) Detection range:0.000-5.000ppm Detection principle:Electrochemistry Response time:Diffusion 15S Duplicate value:2 percent Resolution:0.001ppm Insulation resistance:20M Alarm function:Sound(2-3 beep) Alarm action value:0.3/0.6ppm (alarm on/off switchable) Test content: O3andAQIandTemperatureandHumidity -Electrochemical sensor -TFT LCD screen display -320x240 pixels -Detection data range:O3(0.000-5.000ppm) -It can be used in office, indoor outdoor and detection of ozone residue after disinfection. -24 hours real time monitoring -Power supply:Built in Li-battery 2000mAh -Material : ABS with TFT Screen -Color: BlackandOrange -Size : 164x74x26MM Product weight500g Electrochemistry sensor for O3. Temperature and Humidity sensor. AQI for ozone concentration index. Support time and date, self-calibration function. O3 concentration AQI: 0-0.100- - -Good 0.100-0.300- - -Slight 0.300-1.000- - -Monderate 1.000-4.999- - -Serious Features 2.8" color liquid crystal display (LCD), 320x240 pixels User adjustable alarm threshold for O3 to alert user of elevated levels Test variables, temperature, humidity Large 2000mAh capacity lithium battery On-board fan to draw in ambient air for more accurate real-time results 5V Micro USB charging Low battery warning. Product includes 1 x Ozone Meter