Looking for Bluetooth data loggers with external sensor and waterproof capability to meet your needs?

Temperature Logger with Fast Response Time


TR4A Series
Channels Temperature 1ch (External)
Range -60 to 155 °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 TR42A model features an external sensor for quick response, and can be connected to a variety of sensors for measuring temperatures from -60 to 155°C. The body itself has an IP64 rating and can be used in environments of -40 to 80°C.

Special Features


The water resistance and fast response time make the TR42A suitable for a wide range of applications. We also offer a variety of compatible sensors to help your needs, such as liquid and solid material temperature management.

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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