Transmitting millimeter-waves through materials can reveal interesting insights in the material’s state. In many applications in the insulation, textiles or nonwovens industry a defined set-value for the moisture content in the produced goods is aimed for during the process. In many cases, accurate moisture measurement aims to optimize energy consumption linked to operating gas-fired oven stages. Millimeter wave technology can withstand harsh industrial environments due to its limited sensitivity to dust particles and the robustness of their antenna structures with respect to conventional optical techniques. It is therefore a favorable technology for moisture measurement. A millimeter-wave moisture sensor working in the 60 GHz range is presented. Applying millimeter waves in a transmitter-receive concept, shows a practically-usable measurement spot on the material of 50 mm x 70 mm, enabling accurate moisture-level tracking, even fully-working when moisture is buried deeply within the bulk of a material. Furthermore it is compatible with material thicknesses up to tens of centimeters. The sensor consumes only 8 Watts of electrical power. A static setup, realizing a measurement gap of 270 mm, demonstrates a noise floor of less than 5 gsm at an update rate of 38 Hz (or 2.4 gsm at 5 Hz). This is expecting to realize a relative precision of 1% on typical 500 g/m2 insulation batts in a practical industrial application. The sensor can work up to a moisture level of 1500 g/m2. The pros and cons over conventional techniques such as near-infrared and low-frequency microwaves are being discussed during the talk.