Quantity: one piece Color: silver Size: 132 mm Tips for testing instruments: 1. Watch the temperature change: Place it in an environment with a large temperature difference from the ambient temperature for a period of time, and there will be obvious pointer changes when you look at the thermometer. For example : Put it in the refrigerator, because the mechanical movement changes slowly, it takes longer to change slowly. 2. Watch the humidity changes: you can take a deep breath at the hole at the bottom of the back of the product, and you will obviously see the humidity indicator change upwards, and the indicator will fall again after a while . 3. Watch the change of air pressure: Because the air pressure is different in different places, the display position of the pointer is different, and some areas may also encounter the situation that the pointer with very high air pressure low is below the range and exceeds the range. Atmospheric pressure changes more slowly. Generally, the change is evident when the weather changes from sunny to rain or from rain to sunny. Therefore, if you do not see the air pressure needle moving, please turn the comparison pointer to the same position as the air pressure pointer, then be patient Wait for a few days. The pointer The black of the large disc is the atmospheric pressure pointer and the silver pointer is the contrast pointer. The contrast pointer function can be adjusted to the same value. Then you can compare and watch within a certain period of time whether the atmospheric pressure has increased or decreased. Highly reliable: a weather station with precise analog measurements of atmospheric pressure, humidity and temperature, and display of weather trends Visibility: The measured value is easy to read on the large 132 mm display, and you can easily identify the development of the weather thanks to the trend indicator Adjustable: unlike other weather stations, This device can be adjusted when needed. Contains user manual (not guaranteed in French) and tools (not guaranteed in French) Very high quality: the stainless steel frame, the solid acrylic glass cover and the metal pins are all carefully crafted with an elegant touch and timeless design Durable: can work without batteries or liquid substances, protect the environment and save later costs - The equipment contains fixed materials < /li>