Alphamoisture handheld dew point meter
The SADPmini dew point meter (dew point hygrometer) utilizes a high-purity aluminum rod, whose surface is oxidized into an ultra-thin layer of aluminum oxide film, with a porous gold mesh film plated on the outside, forming a capacitor between the gold film and the aluminum rod. Due to the moisture-absorbing properties of the aluminum oxide film, the capacitance value changes with the amount of moisture in the sample gas. By measuring this capacitance value, the humidity of the sample gas can be obtained.
