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Delmhorst HT‑4000 Thermo‑Hygrometer with Case

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  • Humidity range: 0% to 100%
  • Temperature range: -40° to 255°F
  • Dew point range: -40° to 176°F
  • Calculates dew point, grains per pound (GPP), and vapor pressure (PSI)
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Product Information

Looking for a dependable stand-alone thermo-hygrometer? The HT-4000 from Delmhorst features the same fast-acclimating RH/T sensor found in the popular Navigator Pro moisture meter, delivering fast and accurate readings you can rely on.


The HT-4000 features a bright, clear digital display with a built-in backlight for taking reading in dark or poorly lit areas.  An auto shut-off timer turns the unit off when not in use to conserve battery life. A 9V battery is included.


A convenient data HOLD feature allows you to take readings in hard-to-reach areas where your hand and arm may fit, but not the rest of you, such as crawlspaces, wall cavities, cabinets, and more. 


Like all Delmhorst equipment, the HT-4000 is built to withstand the rigors of heavy use by today's restoration and inspection professionals. This rugged thermo-hygrometer is built to withstand years of heavy use. Plus, it comes with a sturdy plastic carrying case to protect it during storage and transport.



  • Relative Humidity Range: 0%–100%
  • Temperature Range: -40°F–255°F (-40°C–124°C)
  • Dew Point Range: -40°F–176°F (-40°C–80°C)
  • GPP Range: 0.1–3,820 GPP (Grains Per Pound)
  • GPK Range: 0.01–545 GPK (Grains Per Kilogram)
  • Vapor Pressure Range: 0–7 PSI (Pounds Per Square Inch)
  • Vapor Pressure Range: 0–47 KPA (Kilopascals)
  • Size: 8 1/2” x 3 3/8” x 1 3/4”
  • Weight: 11 oz
  • 1 year warranty



  • HT-4000 Meter
  • (1) RH/T-S1 sensor
  • Carrying case


More Information
Brand Delmhorst
Category Thermo-Hygrometer
Warranty Information 1-year warranty
Condition New
Manufacturer Model Number HT-4000W/CS
Thermo-Hygrometer Calculations Dew Point, GPP, Rh, Temp, Vapor Pressure
Thermo-Hygrometer RH Range 0 to 100%
Thermo-Hygrometer Temp Accuracy ± 1.8°F
Thermo-Hygrometer Temp Range -40°F to 255°F
Thermo-Hygrometer RH Accuracy +/- 2%
Manual / Schematic
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