This compact, rugged, easy-to-use wireless clamp thermometer, designed to grip pipes up to 1.5” in diameter, provides accurate temperature measurements of pipes in heating and cooling systems ? ideal for the HVAC professional. Easily monitor and transmit all measured data wirelessly via Bluetooth to your smartphone or tablet from up to 60 feet away. With the free Testo Smart Probes app, you can display measurements from up to six Smart Probes at the same time, visualize measurement value changes as a graph or a table, and perform automatic calculations. Easily turn your data into a custom report, attach images created with the app, and send via email as a PDF or Excel file. Monitor superheating and subcooling in AC and refrigeration systems by using two 115i clamp thermometer probes in conjunction with two 549i Smart Probe high-pressure refrigeration probes. The clamp thermometer can also be used in conjunction with the 510i Smart Probe differential pressure manometer and 805i Smart Probe infrared thermometer to monitor hydronic heating systems.