For heating engineers: The compact differential temperature/pressure kit contains three measuring instruments (2x testo 115i and 1x testo 510i) for carrying out your most important measuring tasks involving heating systems. The testo Smart App enables you to work more easily and efficiently: Use the measurement menus for pressure drop test with alarm function or for non-contact IR temperature measurement with image documentation including measuring value and measurement spot marking. Measurement data reports can be emailed directly as a PDF or Excel file.