That's one of the trade-offs with the single stage, farenheit, controllers. Given that it is spec'd for controlling up to 194degF with 1deg resolution, it needs three digits. The STC1000 reads in celcius and is spec'd up to 99degC with 0.1deg resolution, and it also needs three digits. It appears that most of the single stage controllers use the same front panel led module as the STC1000 like this CH54
However, there are
singles stages out there with full size digits like this
Notice that the labeling on the bezels is different. This might be an indicator.