Topcon RL H5A Self Leveling Horizontal Rotary Laser Level 800m Range, High Accuracy, Long Battery Life Construction & Grading nm hvac ventilation The ARV10RFM 3 Zigbee Battery Radiator The ARV10RFM 3 Zigbee Battery Radiator Actuator replaces the traditional wax element TRV actuator with a smart electrical device to open and close the radiator valve Durable Build: Cast aluminum housing an extended 100 hour battery life Category Details General RL H5A Next Generation Laser Technology Electronic Self Leveling Optical System Horizontal and slope functions Performance High accuracy for construction leveling Range Up to 800 m (diameter) Accuracy ±10 Arc seconds Self Leveling Range ±5 Degrees Durability Built to withstand harsh environments Rating IP66 – Dust and water resistant Power and Battery Efficient and long lasting battery options Battery Type Alkaline or Rechargeable NiMH Battery Life 100 hours (alkaline)