Here are two options for the packaging in the final logging device. The one with the larger screen is of course much more expensive, ~$50. The device with a small 1-inch screen should cost much less, it would have the same computation and communication abilities. We could make the software work on both and both.
The screen will likely be used for simple status information to assure the device is running and recording. Both devices have a button, it may be possible to use this to initiate recording of a firing. Both of these are available without a display, it may not be needed once we are assured of reliable operation (its absence would greatly extend battery life). That being said, a display might be handy to show firing or switch-setting schedules as a reference for programming the controller on the kiln.