The TR4 series comprises three competitively priced models, two of them waterproof. Each model provides different sensor types and measurement ranges to serve diverse application requirements: the TR41 covers temperature measurements from -40 to 80°C (waterproof, internal sensor); the TR42 measures from -60 to 155°C (waterproof, external sensor), while the TR45 for industrial use is available for thermocouple types K, J, T, S covering -199 to 1.700°C or for types Pt 100/Pt 1000 with a range of between -199 and 600°C.

For easy monitoring, the automatically collected data is displayed in neatly arranged graphs by the ThermoRec app or can be uploaded and shared with the ThermoStorage app. Simultaneous data collection from multiple loggers is possible. Each logger can be set to 15 different recording intervals, from one second to 60 minutes, and has a logging capacity of up to 16.000 readings. Battery life is up to one and a half years.