Size: 130mmTest equipment recommendations:1. Observe the temperature change: place it in an environment with a large temperature difference from the room temperature for a while, and observe that the thermometer will have pointer changesobvious. For example: in a refrigerator, it takes longer to change slowly because the mechanical motion changes slowly.2. Observe the humidity change: you can take a deep breath into 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 air pressureextremely low can 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 seeDo not move the air pressure needle, 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 pressureatmospheric increases or decreases over time.[Three-in-one weather station] This product is used to measure parameters such as ambient temperature, humidity and atmospheric pressure, and predict future weather changes based on temperature changesambient air, humidity and atmospheric pressure.【High-quality material】The frame of the barometer is made of solid wood, and the casing is also made of aluminum-magnesium alloy. It has a good finish and is durable. This is a complete weather gauge for the home.【Exquisite decoration】The 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 use】Easy 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 Use】The barometer is suitable for all occasions, whether indoors or outdoors, and it works well even at an altitude of 3000 feet, so you can use it in many places. many geographical areas.