Abstract: A liquid detection apparatus for monitoring liquid stored in a wine barrel may include an upper portion configured to be inserted into an opening of the wine barrel and a lower portion configured to extend into the liquid when the upper portion is seated in the opening. A sensing device may be located within the lower portion and at least partially surrounded by a protective layer. The sensing device may be configured to obtain sensed input for the liquid through the protective layer. An alert system may be at least partially located within the upper portion and configured to generate an alert in response to the sensed input obtained by the sensing device.