Review on Enhancing Indoor Air Quality with IAQ MAX Monitor Data Logger: A Comprehensive Monitoring Solution by Larry Blanco

Usually nothing clearly measured. It read 400 continuously for several days regardless of the environment, then for a while displayed what looked like actual readings (e.g. not keeping time by losing about 8 minutes per hour, which is pretty serious for a watch with a movement , not to mention a modern electronic device.Contacted support who suggested a few things to calibrate and then offered to return them when none of that seemed to help.One star for no function, an extra star for decent customer support .I haven't tried writing data to a computer yet, as the data was a flat line and the time information was useless.I returned it, probably try another brand.