TandD TR-74Ui

  • Records luminence, UV, temperature and humidity
  • Luminosity range 0 -130k lx
  • UV range 0 – 30 mw/cm2
  • Internal exposure accumulation
  • Cosine corrected readings
  • Temperature measuring range: -0°C to 55°C
  • Humidity measuring range: 10% to 95% RH
  • External sensors included
  • USB interface to PC
  • 8,000 point/channel memory



The TR-74Ui Temperature Humidity Light Data Logger can simultaneously measure and record illuminance, ultraviolet light (UV), temperature and humidity. In addition to these, the TR-74Ui Temperature Humidity Light Data Logger is also capable of displaying cumulative illuminance and cumulative amount of ultraviolet light in the LCD display.

The product is an all-in-one package that includes the data logger unit, sensor and software. By simply 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 ItemsTemperatureHumidityIlluminanceUltraviolet Light
Number of Channels1 Ch.1 Ch.1 Ch.1 Ch.
Measurement Range (*1)0 to 55°C10 to 95%RH0 to 130,000 lx0 to 30 mW / cm2
Measuring Accuracy±0.3°C±5%(*2)10 to 100,000lx(*2)±5%(*2)
Measurement / Display Resolution0.1°C1%RHMinimum: 0.01lxMinimum: 0.001mW / cm2
Display Range of Cumulative Measurementn/an/a0 to 90,000,000 lxh6260W / cm2·h
Relative Spectral Responsen/an/a(*4)260 to 400nm
Cosine Correction (cosθ)n/an/a(*5)n/a
Recording IntervalTotal of 15 choices: 1,2,5,10,15,20,30 seconds,
Recording Capacity8000 Readings x 4 channels
Recording ModesEndless (Overwrite oldest data when
capacity is full)
One-time (Stop recording when capacity is full)
Power SourceAA Alkaline Battery x 1
Battery Life (*3)about 6 months
InterfaceUSB Communication
WeightAbout 62 g (including one AA battery)
Operating EnvironmentTemperature: -10 to 60°C
Humidity: 90% RH or less (no condensation)
Attached SensorsTHA-3151: Humidity Sensor x 1
Illuminance and UV Sensor x 1
Accessories included in packageAA Alkaline Battery (LR6) x 1
USB Communication Cable (US-15C) x 1
Introductory Manual (Warranty) x 1
Software Set x 1
*1) when using supplied sensor
*2) when at 25°C and 50%RH
*3) Battery life varies depending upon the type of battery, the
measuring environment, the frequency of communication, and the ambient
temperature in which it is used.
*4) Approximated to the CIE standard response function V (λ)
*5) Within ±1.5% at 10°; Within ±3% at 30°; Within ±10% at 60°; Within ±30% at 80°