NOYAFA JMS11 TVOC HCHO Detector Meter Multifunctional Digital Air Quality Tester with Smart Sound Alert

Features 1 Formaldehyde detection adopts the principle of semiconductor gas sensor 2 TVOC detection Using the principle of semiconductor gas sensor 3 Sound and light alarm LED and other bright red yellow and green respectively represent bad normal and good The buzzer will automatically alarm when the air quality is poor 4 Power reminder 3 LED lights show the remaining power 5 Widely used in indoor office vehicle hotel and other environmental occasions Specifications Model JMS11Display Mode LED digital displayTesting content Formaldehyde HCHO TVOC densityTesting range 0 000 2 888mg m³ HCHO 0 000 9 999mg m³ TVOC Testing theory Semi conductor gas sensor theoryDensity Unit mg m3Working voltage 1 5V 3 2VDimension 133 43 24mmBattery type 2 AA battery 1 5V not included Instructions 1 Unpacking the new machine please place the new machine on the balcony or outdoorWind for more than 2 hours Avoid odorous places 2 Power on preheating install the battery press and hold the button for 5 seconds the digital tube will start 180s countdown the instrument can be calibrated after the countdown is over Do not install the positive and negative poles of the battery reversely otherwise it will not be able to boot 3 Instrument calibration bring the instrument to the outdoors during calibration and the air is fresh and goodIn the place where the instrument is left for 5 minutes double click the button to calibrate calibrateAfter success the instrument