Sap flow module EMS 62 is one-channel battery operated system for the field measurement of sap flow in small stems or branches (further just stems) with the diameter between 6 and 20 mm. The module is intended for cooperation with SF 60 sensors. The module is designed as an independent unit designed for to DIN-rail mounting. The unit contains all electronics necessary for the sap flow measurement based on SHB (stem heat balance) method with external heating and variable power.