The Netvox R718N1 1-Phase Current Meter is a LoRaWAN® end device with an external solid-core current transformer that can be used to obtain the single-phase current of a live wire. R718N1 series have different measuring range for different variety of CT; 30A (Solid Core CT and Clamp-On CT types), 75A (Clamp-On CT), 150A (Clamp-On CT), 250A (Clamp-On CT), 630A (Clamp-On CT).