The DeFelsko DPM1-E Dew Point Meter with Standard Body and Built In Probe measures and records climatic conditions including relative humidity, air temperature, surface temperature, dew point temperature and the difference between surface and dew point temperature. It is ideal for surface preparation as required by ISO 8502-4, BS 7079-B4, ASTM D3276, IMO PSPC, SSPC-PA7 and US Navy NSI 009-32.