Abstract: Described are systems having for sensing that a hygiene activity has commenced and alerting a user upon completion of a minimum hygiene compliance period for that activity. For example, a wearable wrist-band can include a fluid sensor, timing circuitry, a power source, and an indicator. The fluid sensor can begin a timer which is configured to correspond to a minimum length of time for a hygiene protocol, and the indicator can indicate to a user when the minimum length of time has passed and the hygiene condition satisfied.