Best way to monitor temperature in various rooms around the house? (March 2019)

[JDRoberts]

For the step in selecting a sensor, there was a similar question asked this morning by someone else. Take a quick look at the following thread as it may be of help.

Good Sensor to monitor unoccupied 2nd Home temperature?

I would like to utilize a sensor that will alert me when a room reaches a temperature of my choosing. Can the multi purpose sensor do this? If so, which sensor would that be? Thank you in advance.