Looking for Bluetooth data loggers with high waterproof performance?

Temperature Logger with Internal Sensor for Extra Durability and Water Protection


TR4A Series
Channels Temperature 1ch (Internal)
Range -40 to 80°C
Bluetooth 4.2 (Bluetooth Low Energy)



The TR4A series enables data collection and management using dedicated mobile device applications.
Data recorded by the logger is sent to the mobile device via Bluetooth Low Energy, which can then be transferred to our free cloud-based "T&D WebStorage Service" using WiFi or cellular network.

The compact rugged TR41A 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°C).

Special Features


The durability and compact size of the TR41A with a gradual resopnse time to changes in temperature make it perfect for tracking cargo temperature in transport.

We offer free mobile apps that let you access temperature data anytime from your smartphone or tablet over Bluetooth.

"T&D Thermo" facilitates logger configuration and data collection using a Bluetooth connection. The data retrieved by the mobile device can be viewed in a graph, saved, output as a PDF report, and uploaded to the cloud-based T&D WebStorage Service.

"TR4 Report" is a specialized mobile app for generating PDF reports for a specified time period. It allows you to create, print and share data reports in simple steps.


Software & Apps

  • T&D Thermo

    Settings / Download / Graph

    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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