TandD RTR-503B

  • External sensor
  • Water resistant case
  • Temperature measuring range: 0°C to 55°C
  • Humidity measuring range: 10% to 95% RH
  • 8,000 data set memory
  • Measures in both °C, °F
  • Wireless communication range of up to 150 meters (500 feet)
  • LCD Display
  • Battery life of about 10 months
  • Data can be collected remotely via: USB, GSM technology, LAN and handheld data collectors
  • WebStorage Service available
  • Additional Base Station required for communication



Additional Equipment Required


TandD RTR-503B Temperature & Humidity Data Logger

The all-in-one sensor for RTR-503B has a temperature measurement range of 0-55℃ and a humidity measurement range from 10 to 95%RH.

The brand new RTR-500B series allows you to mix and match an array of wireless radio communication loggers with various Base Units or Data Collectors to meet your needs. Logged data can be automatically sent via network or mobile communication to be saved in cloud storage or to a specified location.

RTR-503B data loggers have a wireless radio communication range with compatible base units of up to 150m (500ft).









Data can be transmitted from a logger to a base unit and then automatically uploaded to cloud storage or saved to a specified location. Data can also be checked on your PC screen or on-site with one of our compatible data collectors.

The RTR-503B with its wireless radio communication capabilities is perfect for applications where temperature and humidity at various measurement points are managed at once, such as in temperature-controlled storage facilities and warehouses.

Looking for the RTR-503? The RTR-500 Series has been effectively discontinued, however, existing RTR-500 Series hardware will work with the new RTR-500B Series.

Introduction to the RTR-500B Series


Number of Channels 1 Ch (Temperature)
1 Ch (Humidity)
Unit of Measurement °C, °F, %RH
Measurement Range 0 to 55°C
10 to 95 %RH
Sensor External Temp. and Humidity Sensor (TR-3310)
Sensor Response Time About 7 min (90% response)
Measurement Accuracy Avg: ±0.3°C
± -5%RH (at 25°C and 50%RH)
Measurement Display Resolution 0.1°C
Recording Intervals Select from 15 choices:
1, 2, 5, 10, 15, 20, 30 sec. / 1, 2, 5, 10, 15, 20, 30, 60 min.
Logging Capacity 8,000 data sets (one data set consists of readings for multiple channels)
Recording Mode Endless: Upon reaching logging capacity, the oldest data is overwritten and recording continues.
One-time: Upon reaching logging capacity, recording will automatically stop.
* When using RTR-500BW, RTR-500BM, RTR-500NW/AW, or RTR-500MBS-A as a Base Unit, only “Endless” can be selected.
LCD Display Items Current Readings, Recording Settings,
Battery Life Warning, Over Measurement Range Warning,
Amount of Recorded Data, Unit of Measurement
Power Lithium Battery (LS14250 (SAFT)) x 1
for L type: Large Capacity Battery Adaptor Kit (RTR-500B1 / sold separately)
External Power Adaptor Kit (RTR-500A1 / sold separately)
Battery Life About 10 months
L Type: About 4 years
Communication Interfaces Short Range Radio Communication
Frequency Range: 902 to 928MHz
RF Power: 7mW
Transmission Range: Approx. 150 meters (500 ft) if direct and unobstructed
Bluetooth 4.2 (Bluetooth Low Energy)
Optical Communication
Water Resistance IP64: Splash Proof
Dimensions H 62mm x W 47mm x D 19mm
L Type: H 62mm x W 47mm x D 46.5mm
(excluding protrusions and sensor)
Antenna length: 24mm
Weight About 50g
L Type: about 65g
Operating Environment -40 to 80°C
-30 to 80°C during wireless communication
Accessories Temperature-Humidity Sensor (TR-3310)
Lithium Battery (LS14250 or Large Capacity Battery Kit RTR-500B1), Strap (not included with L Type models), Manual Set (warranty included)
Compatible Base Units RTR-500BC, RTR-500BW, RTR-500BM

WebStorage Service

Free Online Service for Cloud Data Storage

It’s never been so easy to share your recorded data via the Internet! T&D’s free WebStorage Service is perfect for processing and managing data recorded in remote places or for allowing several people to view the same recorded data at their convenience. Users can check the current conditions of data loggers such as battery level and radio signal strength between the Base Unit and Remote Unit. Recorded data can be transmitted to the WebStorage Service from any compatible Tamp;&D product. Data storage capacity is 20MB.

Additionally, the data transmitted to T&D WebStorage Service can be accessed via your browser from anywhere, anytime, as long as an internet connection is available. Mobile device apps are also available for devices running iOS and Android.


T&D 500B Utility Software

T&D 500B Utility software is a mobile application for setting up the Base Station RTR-500BW as well as the registration of Remote Units and Repeaters via Bluetooth or the Cloud.

Download from the iOS App Store here. Compatible with iOS 11.0 or later

Note: An Android version is scheduled for availability in the coming months.