We use Hemo-Temp II on our blood issued in coolers (Trauma, MTP, OR). Additionally, the cooler temp is recorded every 4 hours. Nurses are instructed to request a new cooler if the temp reaches 6°C. The coolers that we use, however, validated to hold 1-6°C for ~24 hours. For blood that comes back from a nursing unit (no Hemo-Temp), we wrap the unit around an NIST probe thermometer. If it exceeds 10°C, we adjust the expiration to 4 hours from issue stipulating that it has to go to the original patient.