DR 26 stem increment sensor is derived from our successful DRL 26 logging sensor. It can be configured as a potentiometer or as a sensor with voltage output. It measures the tree trunk circumference using a stainless band in the range from 8 cm of stem diameter. The range of circumference increment is 64 mm.
This sensor suits for larger measuring systems with central measuring unit. It is also intended as an additional sensor for sap flow systems with EMS81 sensors for large trees.

DB 20 stem increment sensor for manual reading. It measures tree trunk circumference using a stainless band in the range from 8 cm of stem diameter. The range of circumference increment is 60 mm.
The sensor is composed of two parts – measuring part with scale and spring and from the stainless tape that is delivered as spool with 20 m of tape. When moving to another tree with smaller DBH, the sensor can be used again. Only by larger diameters only the tape must be replaced with a longer one.