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This review is from: Digital Thermometer with Hygrometer - TM-871 (Electronics)
The outdoors temp sensor seems to respond to temp reasonably quickly. Both the indoor temp and hygrometer readings need a little time to settle. If using between different rooms/locations I would suggest a period of at least 5 minutes before a measurement is made.
The outdoor temp sensor can not be unplugged.
The two seperate temperature indications offer a form of cross-checking suspect readings assuming they have different circuits.
The unit is very light and has a really cheap feel about it. This I assume is reflected in the fairly cheap purchase price of the unit.
Overall I am happy with it but the cheap feel and permanently connected external sensor makes it lose a couple of stars.