TandD TR-73U

  • Temperature, humidity and barometric pressure logger
  • Temperature measuring range: -0°C to 50°C(-40°C to 110°C with opt. temp only sensor)
  • Humidity measuring range: 10% to 95% RH
  • Pressure measurement range: 750 to 1100 hPa
  • External sensors included
  • USB interface with PC
  • 8,000 point/channel memory
  • Multifunction display
  • Operates up to 10 months on single AA battery



The TR-73U USB Temperature Humidity Pressure Data Logger has three channels: one temperature, one humidity, and one barometric pressure. This compact, lightweight model has been designed with low energy consumption for longer battery life; coupled with its easy-to-use software and USB connection makes this product the foundation of our Thermo Recorder line.

The product is an all-in-one package that includes the data logger unit, sensor and software. Simply by connecting to a PC via a USB connection and carrying out a few easy steps, the measurement and recording of data can be started.

View the TR-7x Product Brochure (PDF) or the TR-7wf/nw Series Overview Video.


Measurement ItemTemperatureHumidityBarometric Pressure
Measurement Channel1 Ch1 Ch1 Ch
Internal Temperature Sensor-10 to 60°C750 to 1100 hPa
0 to 50°C10 to 95%RH750 to 1100 hPa
Option Sensor-40 to 110°C750 to 1100 hPa
Measurement AccuracyAverage ±0.3°C(0 to 50°C)±5%RH (At 25°C 50%RH)±1.5hPa
Measurement Resolution Display0.1°C1%RH0.1hPa
SensorThermistorMacromolecular Humidity SensorBarometric Pressure Sensor
Recording Interval1,2,5,10,15,20,30 sec./ 1,2,5,10,15,20,30,60 min./ Total of 15 choices
Logging Capacity8,000 data sets (*1)
Recording MethodEndless (Overwrite from the oldest data when recording capacity is full)
One time Method (Stop recording when recording capacity is full)
LCD DisplayMeasurements (Ch1 only, Ch2 only, Ch3 only,alternating display), Recording Status,Battery Life Warning, Amount of Recorded Data, Unit of Measurement
BatteryAA Alkaline battery (LR6)
Battery LifeAbout 10month (*2)
InterfaceUSB Communication
USB Communication timeWhen downloading 1 unit at full logging capacity: about 11 sec.
DimentionsH55mm x W78mm x D18mm
WeightAbout 62g (Including AA alkaline batteries)
Operating Environment for Main UnitTemperature: -10 to 60°C
Humidity: under 90%RH (without condensation)
Attached SensorsTR-3100 x 1

(*1) One data set consists of readings for all channels in that type of unit.
(*2) Battery life depends upon the measuring environment, recording interval, and quality of the battery being used.