Looking for tough compact logger that can take some water and keep on logging?

Bluetooth Enabled Temperature Logger with Internal Sensor for Extra Durability and Water Protection


TR4 Series
Channels Temperature 1ch (Internal)
Range -40 to 80°C
Bluetooth 4.1 (Bluetooth Low Energy)



Our very affordable and easy-to-use TR4 Series loggers allow you to keep track of ever changing temperature and check on recorded data via your smartphone or tablet. The compact rugged TR41 model comes with a built in sensor, offers our best waterproof rating (IP67) and is operable in a wide range of environments (-40 ℃ to 80 ℃).

Special Features


The durability and compact size of the TR41 make it perfect for tracking cargo temperature in transport. Using our free app "ThermoREC" with a smartphone or tablet makes it easy to monitor real time TR41 measurements, view graphs of recorded data, make settings changes and upload data to "T&D WebStorage Service" our free cloud storage service. A separate mobile app "ThermoStorage" makes it simple to simultaneously upload data from multiple loggers within Bluetooth range.

And for generating PDF reports that can be printed, saved, shared and sent by email, we offer "TR4 Report" (currently only available for iOS devices).


Software & Apps

  • ThermoREC

    Settings / Monitoring

    For Mobile Devices Available for Free
  • ThermoStorage

    Data Upload to Cloud

    For Mobile Devices Available for Free
  • TR4 Report

    Report Creation / Output

    For Mobile Devices Available for Free
  • T&D Graph

    Graph and Data Management

    For Windows Available for Free

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