The three different lengths of needles (large, medium, and small) look like a family and make me smile. It is said that they use a metal can with a vacuum inside, and use the principle that it dents and expands with changes in air pressure. If you are sensitive to changes in air pressure, you should pay attention to the longest needle. The pictograms of rain, cloudy, and sunny are also fun. Kaoru Mende
The three different lengths of needles (large, medium, and small) look like a family and make me smile. It is said that they use a metal can with a vacuum inside, and use the principle that it dents and expands with changes in air pressure. If you are sensitive to changes in air pressure, you should pay attention to the longest needle. The pictograms of rain, cloudy, and sunny are also fun.
Kaoru Mende