Delmhorst HT-4000 Thermo-Hygrometer Package

Detachable RH Sensor simplifies Concrete testing and remote room RH Monitoring
Manufacturer: Delmhorst
SKU: MC-50130

The Delmhorst HT-4000 Thermo-Hygrometer Package, includes the HT-4000 Meter, (1) RH/T-C1 Cable, (10) CS-3 Sleeves and a carrying case.  This package is used to measure relative humidity in hard to reach places with the cable to extend the distance the RH Sensor can go.    


The GPP Delmhorst HT-4000 is a stand-alone Thermo-Hygrometer for Concrete Floor and Flood Restoration contractors alike. The HT-4000 has the same fast acclimating RH/T sensor found in our popular TotalCheck and Navigator Pro 3-in-1 moisture meters.  The HT-4000 also provides GPP readings.  GPP is the humidity ratio measured as the ratio of the mass of water to the mass of dry air.

For contractors who prefer having separate meters to one combination meter, the HT-4000 is the perfect solution. The meter’s sensor is also detachable, making the HT-4000 ideal for testing a concrete slab according to the ASTM F2170 standard or inserting the RH sensor into a remote location


  • Bright clear, digital display
  • Relative Humidity Range: 0% - 100%
  • Temperature Range: -40°C - 124°C
  • Dew Point Range: -40°C - 80°C
  • GPP Range: 0.1 - 3820 GPP (Grains Per Pound)
  • Accuracy of +/- 2% over 10%-90%
  • GPK Range: 0.01 - 545 GPK (Grains Per Kilogram)
  • Vapor Pressure Range: 0 - 7 PSI
  • Vapor Pressure Range: 0 - 47 KPA
  • Built in Backlight
  • Reading HOLD Feature


  • Size: 8 ½” x 3 3/8” x 1 ¾”
  • Weight: 11 oz
  • Accuracy of +/- 2% over 10%-90%
  • 9V Battery
  • 1yr warranty

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