Hydogels are 3 dimensional cross linked structures that are capable of swelling and deswelling with the level of moisture around them. They can be characterized to swell to different biomedical parameters such glucose concentration, temperature, pH etc. This property has been utilized in a sensor consisting of varying planar dual coil (inductor) and a fixed capacitor fabricated on flexible circuit. The hydrogel is placed between the folded coils and as it swells, the mutual inductance between the coils changes. This change in inductance is sensed wirelessly as the change in the resonant frequency of the device. Wireless monitoring of a commercial wound dressing has been demonstrated with this device.