Comparing the 1825 Hava-Bator thermometer to Janoel8's thermometer which was set at 37.6° Celsius (99.68° F) and the Hava-Bator was reading 101° F, so I lower Janoel8's to 37.5° C (99.5° F) and the Hava-Bator adjusted to 100° F which has been holding at that temperature the last couple of days.
One of the barn yard eggs has piped the outershell and is peeping away at the end of the 18th day. Water channels are full of water and I placed a container of water on the hatching tray to hopefully keep the humidity at 65%. The winter days has evaporated the water from the channels every couple of days and maintaining a good 55-60% humidity range has been a challenge.
The egg turner has been removed at the end of the 18th day and hopefully a good hatch takes place over the next couple of days.