I’ve been using the ITH-21B and IBS-TH5 for over a month and have been very satisfied with their accuracy. Recently, I ordered two additional devices—the IBS-TH2 (temperature only) and the TH2 Plus (with an external probe)—to monitor my refrigerator and outdoor nighttime temperatures.
I’ve noticed the accuracy on these new units is slightly lower than my previous ones. While I know the external probe on the TH2 Plus uses an NTC thermistor, the product description doesn’t clarify what type of internal sensor is used in the TH2 and TH2 Plus. Could you confirm if these also use I2C sensors like the ITH-21B and IBS-TH5, or are they relying on internal NTC thermistors?