Size 130mm Test equipment recommendations 1 Observe the temperature change place it in an environment with a large temperature difference from the room temperature for a period of time and observe that the thermometer will have pointer changes obviously For example in a refrigerator it takes longer to change slowly because the mechanical movement changes slowly 2 Observe the humidity change you can take a deep breath in the small hole at the bottom of the back of the product and you can clearly see that the humidity indicator changes upward and the indicator will drop after a while 3 Observe the change of atmospheric pressure Due to the difference in atmospheric pressure in different places the display position of the pointer is also different In some areas the pressure gauge with an extremely low air pressure may be below and above the range Atmospheric pressure changes more slowly Usually this change is noticeable when the weather changes from sunny to rainy or from rainy to sunny So if you don t see the air pressure needle move turn the comparison needle to the same position as the air pressure needle and wait a few days The black hands on the large dial are the air pressure hands and the silver hands are the contrast hands The contrast pointer function can be set to the same value You can then compare whether the atmospheric pressure increases or decreases over time Threeinone weather station This product is used to measure parameters such as ambient temperature humidity and atmospheric pressure and predict future weather changes based on changes in ambient temperature humidity and atmospheric pressure Highquality materialThe barometer frame is made of solid wood and the casing is also made of aluminummagnesium alloy It has a good finish and is durable This is a complete weather gauge for the home Exquisite decorationThe barometer is both a display and a barometer beautiful and practical Owning it is like having an outdoor barometer hygrometer and weather station Easy to useEasy to install no plug or battery required can be hung on the wall or placed on the counter perfect for indoor and outdoor wall decoration Indoor and outdoor useThe barometer is suitable for all occasions whether it is indoor or outdoor and it works well even at an altitude of 3000 feet so you can use it in many places many geographical areas