The data logger Testo 176 T4 convinces with its parallel temperature measurement at up to four measuring points through various connectable thermocouple sensors. In addition, the data logger has a USB and an SD card interface, which makes reading out the data quick and easy. Further advantages are the larger memory capacity and the power supply via standard batteries. A further advantage of the Testo 176 T4 is the simple checking and documentation of, for example, the flow and return temperature of an underfloor heating system on up to four measuring parts simultaneously.