10 boxes Formaldehyde Air Rapid Test Kit, The latest 20 level formaldehyde colorimetric card , Home/Office Self Testing DIY Indoor Air Testing This Formaldehyde Air Rapid Test Kit is used for rapid and semi-quantitative testing of air formaldehyde without the need for any equipment. For accurater and sensitiver measurement, using SG-F or i2 Formaldehyde Meter. Affordable and easy determination of formaldehyde concentration range by inspecting the liquid color and comparing to a 20-level formaldehyde self testing colorimetric card. Detection range: 0.05-1.20mg/m3 Apply to: home, office, hotel, hospital, school, furniture, car and other internal air formaldehyde rapid testing. English User Instruction. 10 sets / box, One time test per set.