- Signal Sensor + a wireless, waterproof monitoring device designed for embedding in concrete to provide real-time temperature and strength data. With Bluetooth connectivity and a range of up to 15 metres, it supports multiple measurements and is built for the harsh conditions of construction sites. - Signal Live Hub (optional) collects real-time data from the Signal Sensor +™, and view it in ConcreteDNA®. The Signal Live Hub must be installed within 15 m of the Signal Sensor + (up to 20 devices). You can use the Signal Live Hub on successive jobs - it has a rechargeable battery.