What kind of indoor thermometer is better?

Through the comparison of major shopping malls, it is found that the domestic brands of household thermometers are mainly on these two models (perhaps my personal knowledge is limited, and criticism and correction are welcome). One is a Chinese product, and the following is the representative (hereinafter referred to as H):

(49 yuan when I bought it, and it is a long-term stable price; Now it's 39 yuan, and this price change is really that.

Second, virtue products, known as products that have passed measurement certification (hereinafter referred to as M):

There is a certain price difference between the above two products (the price difference is smaller now because the former is from 49 to 99, which is a counterattack). What is the actual accuracy and effect? After I bought it, I did a comparative test.

Please read the link for the introduction of the above two products. Anyway, the parameters are similar.

The test starts from the normal state:

Location 1: bedroom, the actual temperature is unknown. The temperature difference between H and M is 0. 1, and the temperature difference is 0%. As a reference, the mechanical type on the left looks quite accurate.

Location 2: study. The actual temperature is obviously higher than the bedroom temperature. After setting, watch the heating process of the two products.

The sensitivity of H is quite good, the temperature rises rapidly, and M belongs to the steady rising stage. Finally, the temperature and humidity are fixed: the temperature difference is 0(30.2-30.2) and the temperature difference is 1%(74%-75%), which is comparable.

Someone must find it boring to do such a test with nothing to do. Yes, I will continue later: turn on the air conditioner (Gree) and adjust the temperature to 28 degrees to see their changes.