If you want to weld thin or thick geomembranes (0.5 to 2.5 mm) 20-100 mils quickly, easily and safely, the TWINNY T7 or TWINNY T5 are your go-to automatic welders. Both tools are well-rounded, thanks to their practical design and intuitive operation. The TWINNY T7 comes equipped with highly-efficient data recording ability thanks to the LQS function, GPS, Wi-Fi and connection to the myLeister app. are guaranteed. Switch on and start welding – TWINNY T7and T5.