It arrived relatively quickly and the article meets the specifications indicated. The shown values of TOVC and HCHO fluctuate a lot (Mark a value and within seconds double and then return to the initial), which does not happen with another meter I have. I don't know if it's a malfunction or a normal thing. CO2 values are lower than those indicated by my other meter, but I cannot know what the true value is.

The meter appears to function as it should and it responds to clear changes in different conditions. Its a bit unclear to me how exact the device actually is but i guess it should at least give good indication.

Basic product but who does the job The thermometer does not look accurate and for other sensor it is also difficult to validate their reliability. Gives at least trends

Excellent. Bought two, both working and agreeing with one another. Tracking 8 days after order. Delivery forecast 19 days from order, actual 18 days.

Hello dear I have arrived the product and it is in very good condition very thank you to the seller I am very very very very very very very