1. Simultaneously output seven sets of data, including CO2, formaldehyde, TVOC, PM2.5, PM10, temperature and humidity 2, CO2 adopts single-pass NDTR mode, with 24-hour automatic calibration function 3, formaldehyde using electrochemical sensor 4. PM2.5 is based on TSI8530 as the standard, which is consistent with the test equipment of most measurement bureaus. 5. The VOC test result is relative value 6, temperature accuracy 0.1, humidity accuracy 0.1% Colour:As Shown Material:PC+metal Package Contents: 1 x sensor module( TW701-UART) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.