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formaldehyde HCHO TOVC air quality analyzer Product descriptionProduct name formaldehyde detectordetection technologyHazardous Substances conduction flow detection technologydisplay modeLCD + LCD backlightworking voltage3.7-5Vproduct size137x66x24mmtempeture range5-15degreehumidity range15-90%RHdetection folat4% charging timeabout 4 hoursEnergy-saving standbyabout 20 hourshigh precision64 bit high-speed processor Charging function: √LCD backlight display: √ Product picture: Patent certification : About us: Contact info: Shenzhen Ohmeka Technology Co.,Ltd Miki Luo Mail: mikiluo[@]ohmeka.com Phone/whatsapp:13828620802Skype: OHMEKA-Miki Luo (mikiluo[@]ohmeka.com) RM1203 Bulong City Sunlan Buji Street Longgang District Shenzhen,ChinaTel:+86-755-84552229Fax:+86-755-84552230 Product in our daily life:Packaging &Shipping:Packaging Details: 20pcs/box cartoon size :37x37x23cm. net weight: 135g / gross weigh