When you need to monitor -80C or below freezers, we recommend our Expanded Range Sensor (AC-TMPEXRJ12).
The AC-TMPEXRJ12 is an expanded range temperature sensor that can measure temperatures from -200C to +200C (-328F to +392F). Compatible with TempAlert Ethernet Gateway and Cellular Edition devices, the Class A RTD temperature sensor is encased with a diameter of 4 mm and length of 150 mm stainless steel (316) sheath and wired with high temperature rated teflon cable protected by a stainless steel braid. The included cable length is 6'. Longer lengths are available - please contact firstname.lastname@example.org for details.