Let me add up a short opinion with regard to the discussion of SDD fridges and the use of their built in thermometers. I have been involved in temperature monitoring and handling of temperature sensitive goods, especially pharma, for many years in Russia. I can tell you that the current practices maintain that the SDD monitor cannot be an adequate means of temperature control, since the sensor is located at the rear of the fridge and always shows a somewhat lower temperature than that in the fridge. Moreover, such a built in sensor is not subject to сalibration and verification wether it works accurately or not. It also is not capable of recording temperature (some of them can record min/max temp. but without duration info). Almost for a decade the WHO has been promoting the use of specially designed devices for temperature monitoring such as Fridge-tag electronic recorders. As opposed to ordinary thermometers, Fridge-tag devices make it possible to trace and record temperature fluctuations and excursions over 30 days, which provides an accurate and relevant information on temperature in the fridge. Therefore I would recommend that you should avoid relying on SDD temperature sensors and shift to the reliable temperature monitoring devices such as Fridge-tag or Fridge-tag 2 which are prequalified by the WHO and which are world wide used to monitor temperature sensitive goods.
One more point, for information "VMH-E2-01.1: How to monitor temperatures in the vaccine supply chain" page 14:
"Integrated digital thermometers: The current range of prequalified vaccine refrigerators and freezers are equipped with these devices (see Figure 9). An internal temperature sensor monitors the coldest point in the vaccine storage compartment, and an instantaneous temperature reading is displayed on the unit’s control panel. Solar direct-drive refrigerators typically have a device powered by an integrated photovoltaic cell—these do not work at night or in dim light and may have to be activated by a flashlight."
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