The S-1 is obsolete and has been replaced by the S-11.
S-1 Wireless sensor monitors Temperature, Humidity and Moisture Content (also known as WME or Wood Moisture Equivalent).
S-160 Wireless Temperature, Humidity and Moisture Content (WME) Sensor with 64K Reading Datalogging Memory, replaces S-16, improves on S-16 with addition of a status LED and uses improved T/RH sensor with faster response time.
Wireless Sensor with 2 plug in 3.5mm jacks for 2 channels of Temperature and Humidity, a Moisture Content (WME) plug in socket, 64K Reading Datalogging Memory