Watermark soil moisture sensor uses electrical resistance to measure the moisture level of the soil.
Does not require periodic maintenance during the growing season. Simply bury at the desired depth, then monitor moisture levels throughout the season. Add up to 4 sensors to a single Leaf and Soil Moisture / Temperature Station. Includes a 15ft (4.6m) cable.
Description
Part Code (McMurdo)
Soil Moisture Sensor for 6343 Leaf & Soil / Temperature Station
Full Accessories List 
Watermark soil moisture sensor uses electrical resistance to measure the moisture level of the soil.
Does not require periodic maintenance during the growing season. Simply bury at the desired depth, then monitor moisture levels throughout the season. Add up to 4 sensors to a single Leaf and Soil Moisture / Temperature Station. Includes a 15ft (4.6m) cable.