Backlit LCD displays TVOC (Total Volatile Organic Compound) and HCHO (Formaldehyde) concentrations simultaneously in real-time Complete with rechargeable battery and Universal AC Adaptor/Charger (multi-plugs US, EU, UK, and AU) Built-in fast response, high accuracy fuel cell Formaldehyde sensor Two selectable units of measure (ppm, mg/m3) Adjustable audible and visible high/low alarms Auto Power Off Specifications Resolution 0.01ppm Charge Time approx. 3 hours TVOC 0.00 to 9.99ppm (mg/m") Formaldehyde (CH?O or HCHO) 0.00 to 5.00ppm (mg/m") Weight 1.3lbs (584g) Response time <2s Power supply Rechargeable battery and AC adaptor Dimensions 6.5"2.4"1? (165 x 60 x 25mm) Basic Accuracy "5%FS