Caltech Engineering Services offers ET-931 Digital Psychrometer / dew point meter. ETI-931 Dewpoint Meter is an easy way to use and check air temperature, relative humidity, wet bulb temperature and dew point.

The Digital Psychrometer / Dew Point Meter has option of humidity which measures %rh over the range of 0 to 100 %rh with a resolution of 0.01 %rh and temperature over the range of -30 to 100 °C with a resolution of 0.1°C. This instrument also measures dew point just by pressing mode button of the instrument. This humidity meter incorporates a clear custom LCD with °C, %rh, dew point, and max/min indication. It has excellent features for fast, accurate measurements for analysis of critical environmental conditions:

ET-931 Digital Dew point meter is powered by 9V battery. An auto power off facility turns the dew point meter, maximizing battery life.

  • Fast Response
  • Time %RH : 10S (90% at 25°C still air)
  • High Accuracy, Temperature, Humidity, Dew point Temperature, Wet Bulb Temperature
  • Max Hold and Data Hold Function
  • Power source: battery powered
  • Power saving: auto-off, Disable Sleep Mode
  • Dual Display: Temperature and Humidity
  • Display type: LCD digital 3.5 Digit
  • Warranty: one year

Portable digital hand held digital hygrometer / dew point meter determines the temperature and relative humidity in the body shop or paint booth in just seconds. A Hygrometer is an instrument used to measure relative humidity (RH), which is the quantity of water vapour present in the air.

Suitable for paint manufacturer, painting inspector, painter, sand blasting contractors, finishing, anti- corrosion painting contractors to monitor climatic conditions during the application of a coating/lining. Determining the dew point enables to decide weather painting the surface in the existing conditions is advisable.

Essential instrument in power generation, natural gas drying, compressed air lines, medical oxygen, electrical circuit breakers, breweries, food cans packing, air dryers, air-conditioner manufacturers, pharmaceuticals, cold storage plants, automobile industries, freezing plants, automobile repair, quality control departments, petrochemical, welding, pipeline industry, aeronautical, chemical, packaging industry, offshore, oil & gas, water industries, and laboratories.

Alternative equipment for determining the temperature, relative humidity and dew point are the whirling hygrometer and also dew point calculator

Specification Temperature Humidity
Range -30 to 100°C 0 to 100% rh
Resolution 0.1°C 0.01% rh
Temperature -35~100°C  
Dew Point Temp -30-100°C Wet Bulb Temp  0-80°C
Accuracy ±0.5°C ±1 digit Max ±2.5% (0 to 100 %rh)
Battery  9 volt Battery
Display 1.5” LCD
Dimensions 22.5 x 4.3 x 2.6 cm
Weight 200 grams
ET-931  RH%- Dew Point Meter / Thermohygrometer
 H1001  Whirling Hygrometer
 H1002  Universal Dew Point / RH% Slide Calculator
 ETI-6000 Thermo-Hygrometer