Hi Geekfarmer Not something I'm familiar with I'm afraid, members like Andy or Jean may have experience with this type of thermostat. However, looking at this site www.growerssupply.com/farm/supplies/prod1;gs1_seed_germination;pg106148_106155.html if you use the Zoom Image and using then the magnifier tool it looks like there is only one temperature control dial.
"The kiss of the sun for pardon, the song of birds for mirth; one is nearer god's heart in a garden than anywhere else on earth."
Not something I'm familiar with I'm afraid, members like Andy or Jean may have experience with this type of thermostat. However, looking at this site