Yes, you can see/use decimal precision with SmartThings. It is a function of the DTH and the device. In fact, many of the SmartThings temperature devices send at least 1 decimal digit of precision for F temperatures; many actually pass that through in the sendEvent(name: temperature, value: temp, …) call, but the default tiles tend to truncate the precision when displaying them. FWIW, they used to simply drop the digit (temperature.toInteger()), but most now seem to do the right thing (Math.round(temperature.toDouble())).