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 % 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: O3+AQI+Temperature+Humidity -Electrochemical sensor -TFT LCD screen display -320*240 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: Black+Orange -Size : 164*74*26MM 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 Feature: 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. Package includes: 1pc of Ozone Meter Warming Tips: Computer monitors display colors quite differently,the color of the article may vary slightly from the pictures above.