Sapflow-Sensor Type SFS2 M-M12. Sensor-pair consisting of two needles with copper-constantan-thermocouples, 20mm heating-zone, 70cm connection-cable with Binder-M12-connector. Needs 84mA constant-current-source! Total needle-length 33mm, diameter: 19mm. Incl. 2 aluminium-tubes 2mm diameter and 23mm length.