Matobuy Air Quality Meter Multi-tester Air Pollution Meter Air Quality Detector Digital LCD Formaldehyde Detector HCHO/TVOC Tester AQI Air Quality Monitor Gas Analyzer (JSM-131) This device can accurately detect the content of formaldehyde and other substances. It is a necessity for new homes and new offices. It is also very easy to use. * Immediate purchase is welcome, silent purchase at midnight is OK ◎ * One-of-a-kind, first-come, first-served * Discounts are also available for bulk purchases within the shop! Welcome, feel free to comment ♪ Click here for a list of products ☜ ※ To keep prices as low as possible, we may remove the item from its box or compress it for shipping due to shipping costs. Please understand that this item is stored at home and will be shipped in simple packaging before purchasing.