Pack containing 7 unused wireless temperature sensors, with QR codes, as used in the heat treatment process for incoming COVID-19 swab samples made by Disruptive Technologies, Norway, of the type used at Cambridge COVID-19 Test Centre, based at the Anne McLaren Building on the University of Cambridge Biomedical Campus, April 2020 - April 2021 QR wireless temperature sensors of type used with COVID-19 samples 2015-2020