testo 184 T2 Temperature Data Logger

Amazon

Large easy to read display Up to 150 days of operation with large memory capable of 40,000 readings PDF Reports allow for quick access to non-corruptible documentation - without installed software

Test-meter.co.uk

Single-use temperature data logger for cold-chain transport, -35˚C to 70˚C range, ±0.5˚C accuracy, 40,000 reading memory, USB configurable, IP67 rated, 150-day operation.