Testo 0560 1115 115i smartprobe bluetooth clamp thermometer testo 0560 1115 p the testo 115i is a simple to use clamp type thermometer for measuring the surface temperature of pipes up to 35mm in diameter typical applications include monitoring the flow and return temperatures in heating or cooling systems and radiators p p measurement data is transmitted wirelessly from the clamp thermometer via bluetooth to the testo smart probes app and can be viewed conveniently on your smartphone