The sensor measures: current, temperature, inclination (for sag, clearance, icing and de-icing) and ambient temperature with humidity of power lines simultaneously. Tension forces are calculated from the sag measurement. Temperature is measured directly at sensor fixing points on the phase conductor. Measurements are transmitted to the dedicated server via available network (options: mobile – SIM card, LoRa, WiFi or satellite) with the exact GPS time stamp. The harvester within the sensor provides power supply for operation without any other outside source of power supply. Housing is made of fire-resistant material for heavy ambient conditions. In case of communication failure, measurements are stored locally in the sensor (last 10.000 measurements). The sensor can be installed on the conductor with a diameter from 15,00 mm and up to 45,00 mm. The sensor can be installed on a voltage level up to 500 kV. The sensor has a built-in GPS sensor that is used to locate the installed sensor as well as time synchronization. OTLM sensors are provided with all needed installation tools.