Barometer: A 3-in-1 function consisting of an outdoor thermometer, hygrometer and analog barometer The weather station has an accurate analog display of atmospheric pressure, humidity and temperature , as well as a convenient, practical and accurate weather trend display. Wall-mounted: light weight, hanging installation, the back is reserved in the hanging hole, suitable for hanging on the wall or In the office, the dial appearance has a clear weather display that is suitable for weather assessment. Fashion High Quality: High quality aluminum alloy frame ring, made of PMMA plastic, high quality materials for long service life. Classic and practical. No special maintenance or batteries are required for long-term use. Measurement range: thermometers in all climate zones are exactly -30-50C, humidity 1-99 percent rF, atmospheric pressure 970-1050hPa. Wide range of applications: analog weather station suitable for indoor and outdoor use. Very suitable for installation in bedrooms, indoor gardens, warehouses, living rooms, offices, etc. Product parameters: Product: thermometer, hygrometer, barometer weather station three in one Item model number: THB9392 Measurement range: 960-1060hPa, -30-50, 0-Rh Resolution: 1hPa, 1 , 2 percent Rh Measurement accuracy: 5hPa, 2, 5 percent Rh(40-70 percent Rh) Product size: approx 13 x TH 4.1cm Testing meter tips: 1. Watch the temperature change: Put it in an environment with a large temperature difference from the room temperature for a while, and there will be obvious changes in the thermometer needle. For example: put it in the refrigerator, because the mechanical movement changes slowly, it takes longer to change slowly. 2. Look at the humidity change: you can take a deep breath at the place with a hole at the bottom of the back of the product, and you will clearly see the upward change of the humidity pointer, and the pointer will fall back. after a while. 3. Watch the air pressure changes: Due to the different air pressure in different places, the display positions of the pointer are different, and some areas may also encounter the situation where the pointer with very low air pressure is deviated to the lower range and exceeds the range. Air pressure changes more slowly. Generally, the change will be evident when the weather changes from sunny to rainy or from rainy to sunny. Therefore, if you do not see the air pressure needle move, please turn the comparison pointer to the same position as the air pressure pointer, and then be patient. Wait a few days. 4. The black pointer is the air pressure pointer, and the silver pointer is the comparison pointer. The function of the comparison pointer can be adjusted the same as the air pressure pointer, then you can compare and watch within a certain time of time to see if the atmospheric pressure has increased or decreased.