The DPME-ST probe type dew point meter consists of a transmitter probe and a secondary display instrument. The transmitter probe is directly installed on a gas pipeline or a storage tank for analysis and measurement, and the secondary display instrument processing signal value displays a measurement reading. This instrument is used in the semiconductor industry, drying industry, food industry, power industry, machinery manufacturing, air separation industry, pharmaceutical industry, routine measurement of compressed air, nitrogen, argon in trace moisture content.