ABSTRACT
The ACA-Derm Moisture Meter (ACA-DMM) is a device intended to measure the water content of the skin surface in vivo. The ACA-DMM is a simplified version of the experimental focused-microwave dielectric probe developed by Steven Jacques. The ACA-DMM is not a conductance, resistance, capacitance, or impedance device. Instead, the battery-operated probe directs a 200 to 400 MHZ electromagnetic wave into the skin surface penetrating the dead outer-most layers of the stratum corneum. The wave is transmitted from the signal generator of the instrument through a coaxial cable to the probe tip. The cable serves as a waveguide. A grid on the probe tip controls the depth of penetration and focuses the electromagnetic field to a few micrometers from the surface.
