The HT-4000F is a stand-alone thermo-hygrometer for flooring installers and inspectors. The HT-4000F has the same fast acclimating RH/T sensor found in our popular Total Check 3-in-1 moisture meter. For flooring contractors who prefer having separate meters to one combination meter, the HT-4000F is the perfect solution. The meters sensor is also detachable, making the HT-4000F ideal for testing a concrete slab according to the ASTM F2170 standard.