A wireless sensor measures properties of a substance and transmits the properties to a remote wireless receiver. The wireless sensor can be fully enclosed within a container containing the substance, allowing remote monitoring of the properties of the substance without compromising integrity of a closed system.

A wireless sensor that can measure properties of a substance and transmits the properties to a remote wireless receiver is disclosed. The wireless sensor can be fully enclosed within a container containing the substance, for example, allowing remote monitoring of the properties of the substance without compromising the integrity of the closed system.

A wireless sensor that can measure properties of a substance and transmits the properties to a remote wireless receiver is disclosed. The wireless sensor can be fully enclosed within a container containing the substance, for example, allowing remote monitoring of the properties of the substance without compromising the integrity of the closed system.

Sample processing methods and apparatus are discussed. In some cases, apparatus are discussed that include: a mixing element having a first volume and a mixing chamber. The first mixing volume comprises: a sealed first housing having a first interior region, a sensor set disposed in the first interior region and configured to sense a set of characteristics of the mixing element, and a wireless transmitter disposed in the first interior region and configured to communicate the set of characteristics. The mixing chamber comprises a liquid port and a second housing having a second interior region. The mixing element is disposed in the second interior region having a second volume, and the liquid port configured to transmit the liquid into the second interior region.