The Circular chart temperature recorder is specifically made for the purpose of transporting perishable goods under a controlled temperature condition. It is powered by gas expansion technology. To be able to comply with the standards of the NF EN 12830, this instrument is made fixed inside the compartment for it to be consistently monitored. It contains a single or two channels, has a measurement accuracy at 23°C : T : ±2% (class 2 of the EN 12830 standard) and a measurement range of -25°C+25°C in a recording time of 24 hours or 7 days or 28 days.