_2100_A quick glance at the mfg website suggests the two temps are for the remote sensor and for the package of the unit itself. I am in no way a technical person, rather quite new to the DIY space. Not sure this will clear anything up for you, as it does not provide the info as to what the remote sensor is reading. It just eliminates one of the temps as reading the package of the sensor itself. https://www.maximintegrated.com/en/products/sensors/MAX1617.html/tb_tab0 DescriptionThe MAX1617 is a precise digital thermometer that reports the temperature of both a remote sensor and its own package. The remote sensor is a diode-connected transistor—typically a low-cost, easily mounted 2N3904 NPN type—that replaces conventional thermistors or thermocouples. Remote accuracy is ±3°C for multiple transistor manufacturers, with no calibration needed. The remote channel can also measure the die temperature of other ICs, such as microprocessors, that contain an on-chip, diode-connected transistor.