Portable (movable) thermostat?

[RBoy (www.rboyapps.com - Making SmartThings Easy!)]

As JD said you need a simple temperature sensor and an app which will use that temperature sensor to adjust your CT thermostat.

If you have access to RBoy Apps check out these apps which can use a remote temperature sensor:

[RELEASE] 5-2 Day Programmable Thermostat Scheduler (Weekday, Weekend) with Remote Temperature Sensor for each Schedule

[RELEASE] Ultimate Mode Based Thermostat - Control Multiple Thermostats Temperature / Remote Temperature Sensors when Changing Modes