Abstract: A system for tracking a plurality of objects, including a server system and gateways, wherein each object includes a battery arranged to power it, a non-transitory storage medium, an object ID stored in the storage medium, a first transceiver and a second transceiver, wherein the second transceiver is different to the first transceiver and the first transceiver of each object is arranged to communicate with a first respective gateway, and wherein the second transceiver of each object is arranged to communicate with a second respective gateway. Each object includes at least one sensor and is configured to sense and transmit sensory data. The server system is configured to store a tracking record of each respective object in association with the respective object ID.

Abstract: There is disclosed a system including a portable CO2 measuring device and a mobile device, the mobile device including a processor and a display, the mobile device storing software, the mobile device configured to communicate with the portable CO2 measuring device, the portable CO2 measuring device configured to measure CO2 measurement data, wherein the software is executable on the mobile device to receive the CO2 measurement data from the CO2 measuring device, and to display CO2 measurement results derived from the CO2 measurement data on the display of the mobile device.