福丁式水銀氣壓計為1810年發明，利用水銀測量大氣壓力。應為日本時期用於顯示實驗室環境使用。 迄今中央氣象局部分山岳測站仍在使用中，但主要作為校準用。從氣壓計所測得的氣壓為「觀測氣壓」。「觀測氣壓」經重力、溫度及儀器差訂正後而得「測站氣壓」。「測站氣壓」再依測站的高度換算，就可以得到「海平面氣壓」。

The Fortin mercury barometer, invented in 1810, measures atmospheric pressure using mercury. It was likely used during the Japanese period for monitoring laboratory conditions. Today, some mountain weather stations under the Central Weather Bureau still use it, primarily for calibration purposes. The pressure measured by the barometer is referred to as “observed pressure.” After corrections for gravity, temperature, and instrument differences, this becomes “station pressure.” The “station pressure” is then adjusted according to the station’s elevation to derive “sea level pressure.”