Data Loggers Measurement Type - Temperature & Humidity & Barometric


Estimated delivery within 4-7 working days

TR-73U has a total of three channels: one temperature, one humidity, and one barometric pressure channel. 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.

Download Brochures:
Measurement Item Temperaturey Humidity Barometric Pressure
Measurement Channel 1 Ch 1 Ch 1 Ch
Internal Temperature Sensor -10 to 60°C - 750 to 1100 hPa
External Sensor 0 to 50°C 10 to 95%RH 750 to 1100 hPa
Option Sensor -40 to 110°C - 750 to 1100 hPa
Measurement Accuracy Average ±0.3°C(0 to 50°C) ±5%RH (At 25°C 50%RH) ±1.5hPa
Measurement Resolution Display 0°C 1%RH 0.1hPa
Sensor Thermistor Macromolecular Humidity Sensor Barometric Pressure Sensor
Recording Interval 1,2,5,10,15,20,30 sec./ 1,2,5,10,15,20,30,60 min./ Total of 15 choices
Logging Capacity 8,000 data sets (*1)
Recording Method Endless (Overwrite from the oldest data when recording capacity is full) One time Method (Stop recording when recording capacity is full)
LCD Display Measurements (Ch1 only, Ch2 only, Ch3 only,alternating display), Recording Status,Battery Life Warning, Amount of Recorded Data, Unit of Measurement
Battery AA Alkaline battery (LR6)
Battery Life About 10month (*2)
Interface USB Communication
USB Communication time When downloading 1 unit at full logging capacity: about 11 sec.
Dimentions H55mm x W78mm x D18mm
Weight About 62g (Including AA alkaline batteries)
Operating Environment for Main Unit Temperature: -10 to 60°C
Humidity: under 90%RH (without condensation)
Attached Sensors TR-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.



1: External Sensor Jacks
2: Power Switch
3: LCD Display
4: Display Switch
5: Interval Switch
6: Record Switch
7: USB Connector
8: Serial Connector(RS-232C)
9: Humidity and Temperature Sensor (*1)
10: Sensor Connector

*1 Barometric pressure sensor is inside body case

Application Examples

*Measuring weather data
*Measuring the degree of air tightness in packaging
*Setting barometric pressure for use with industrial and medical equipment
*Measuring barometric pressure in high-rise buildings (elevators)
*For growth management in mushroom cultivation

What is "RTCA DO-160E, Section 21"?

RTCA stands for "Radio Technical Commission for Aeronautics", a not-for-profit corporation formed to advance the art and science of aviation and aviation electronic systems for the benefit of the public, helps to develop standards to assure the safety and reliability of all airborne equipment. (

The "DO-160E", published by RTCA, is widely used as a standard for environmental qualification testing to show compliance with appropriate airworthiness requirements. "Section 21 of DO-160E" concerns the "Emission of Radio Frequency Energy". The tests in this section are performed to determine that the device does not emit radio frequency interference in excess of the specified limits. Every carry-on electronic device must comply with radio frequency emission and susceptibility guidelines outlined in "Section 21 of the RTCA DO-160E"" document, whether it flies in the passenger cabin or cargo hold. The "DO-160E" is recognized by the International Organization for Standardization (ISO) as a de facto for international standard "ISO-7137". 


USB Connection

Our easy-to-use USB computer connection makes things not only simple, but allows you to connect several units at the same time.

Simultaneous Monitoring of Multiple Channels of Data

With the attached software it is possible to view current measurements and current trends in a changing graph form. Graphs can be opened for the same number of units as are connected and can be simultaneously viewed. 

Logging Capacity: 8,000 Data Sets

One data set consists of readings for all channels in that type of unit: Temperature, Humidity, and Barometric Pressure. At the longest recording interval of 60 minutes, recording can continue consecutively for one year.

Accurate, Compact, Lightweight and Affordable

Our exclusive design and technology has allowed us to create a highly accurate yet compact and lightweight unit (55x78x18mm 62g) that is unbelievably affordable.

One Year Continual Use on One Set of Battery

Using our specially designed low energy consumption circuit this unit can run on two AA alkaline batteries for up to one year of continued use. No need to worry about where you place it as the battery will allow you to measure and record over long periods of time whether the unit is in transit or in a distant place.

Battery life will depend on the recording environment, recording interval, communication frequency, and ambient temperature. The above battery life test was carried out using brand new batteries and in no way do we guarantee a battery's life.

Adjustment Function

By setting adjustment values beforehand, you can record and display the post-adjusted measurement values.

High Speed Data Transfer

Possible to transmit one unit of full data (8,000 readings) to computer in about 11 seconds.

Easy to Read Multi-Functional Display.

The easy to read large sized LCD displays present readings, recording condition, battery life warning, amount of data readings, and unit of measurement among other things.

1. Recording Mark
The recording condition will appear.
ON:Recording in progress.
BLINKING:Waiting for programmed start.
2. Data Capacity Scale
After every 2000 readings the scale will be marked from left to right.
3. COM Mark
This will appear when data is being sent or received.
ON:USB cable is connected.
BLINKING:In communication with computer.
4. Recording Mode
ONETIME: When the number of recorded readings reaches 8000, "FULL" will appear in the unit's LCD display and recording will automatically stop.
ENDOLESS: When the number of recorded readings reaches 8000, the oldest data reading will be overwritten and recording will continue.
5. Battery Life Warning Signal
When the battery power becomes low, this will appear in the LCD display. If the battery power becomes even lower, SLP will appear and normal operations will stop. If the signal appears, please change the battery as soon as possible.
6. Unit of Measurement
The unit of measurement for the display will appear.
7. Measurements and Messages Area
Current measurements or operational messages such as FULL or SLP will appear.