Product Description The Bosch PTD1 Thermal Detector for easy measurement of room temperature, surface temperature of walls and window, as well as calculating humidity, thermal bridges and assessing mould risk. Using a laser circle to measure the data, the tool then gives a clear recommended course of action using a 3 LED colour traffic light system. Simplistic buttons and display symbols allows for easy measurement of surface and room temperatures. Laser circle marks the measuring area for fast location of thermal bridges and mould risk areas. Automatic analysis enables easy interpretation of measuring results.