HT-4000F Thermo-Hygrometer

The HT-4000F is a stand-alone thermo-hygrometer for flooring installers and inspectors. The meter’s detachable sensor makes the HT-4000F ideal for testing a concrete slab according to the ASTM F2170 standard. It has the same fast acclimating RH/T sensor found in our popular TotalCheck 3-in-1 moisture meter. For flooring contractors who prefer having separate meters to one combination meter, the HT-4000F is the perfect solution.

Where to Buy

Product Features

  • Bright, clear digital display.
  • Relative Humidity Range: 0% - 100%, sensor can be used for in-situ concrete testing following the ASTM F2170 standard
  • 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 - 3820 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).
  • Built-in back-light makes reading in dark places a cinch.
  • Auto shut-off timer saves battery life.
  • Reading HOLD Feature.
  • Size: 8 ½” x 3 3/8” x 1 ¾”.
  • Weight: 11 oz.
  • Rugged construction ensures years of reliable use.
  • Sturdy plastic carrying case.
  • 9V battery.
  • 1-year warranty.

Flooring Package: Includes meter, carrying case, (1) RH/T-S3 sensors, (1) RH/T-C1 cable for easy reading while sensor is in concrete, and (10) CS-3 concrete sleeves for testing in multiple sites. Order as HT-4000F/PKG. (Price: $670.00)

HT-4000F Thermo-Hygrometer Accessories:



3" Plastic sleeve required when performing ASTM F-2170 tests on concrete. Used with the RH/T-S3 attachment included with the Total Check and HT-4000F. Order in packs of 20 as CS-3/20.

Relative Humidity Test Kit

The relative humidity test kit is great for testing the accuracy of our detachable RH/T-S3 relative humidity sensors. The air inside the test kit bottle is controlled by a salt solution, which keeps the relative humidity constant. The kit is available with either 33% or 75% relative humidity (Order asRH/TK/33 and RH/TK/75 respectively).

RH/TK/33 (Price: $125.00)

RH/TK/75 (Price: $125.00)



Extension cable that connects to the RH/T-S3, allowing you to easily view your meter’s screen while performing ASTM F-2170 tests on concrete.

(Price: $55.50)



Detachable relative humidity/temperature sensor that is included with Total Check and HT-4000F. Can be used to obtain ambient RH/T readings, or for performing ASTM F-2170 tests on concrete. Order individually or in packs of 5 as RH/T-S3/5.

Order as:

RH/T/S3 (Price: $128.50)

RH/T/S3/5 (Price: $625.00)

HT-4000F Thermo-Hygrometer Electrodes:

Delmhorst offers a wide assortment of electrodes known throughout the industry for their durability. All Delmhorst electrodes fit any Delmhorst moisture meter. Below are electrodes that are typically used for this model:

Manuals & Training

Owner's Manual

Product Manual

Download Manual (pdf)


Relative Humidity Sensor Behavior and Care

Download Whitepaper (pdf)

Online Learning

Interactive Training Course

Click here to start learning


Moisture Meters 101 Guide

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