UEI Test Instruments
Quad Input IP67 Digital Logging Thermometer
The DT304 is a rugged four-channel digital temperature logger for HVAC/R, refrigeration, industrial maintenance, food service and temperature-critical service work.
Technical snapshot
Key DT304 measurement specs.
A compact overview of the main input types, measurement ranges and logging features used for HVAC/R and temperature-critical service work.Four-channel temperature logging
Measure, compare and record multiple temperature points at the same time.
The DT304 accepts J, K, T and E type thermocouples and supports up to four temperature channels. It can display paired readings and differential values, making it useful for supply and return air, refrigeration performance, pipe temperatures, heat exchanger checks and multi-point equipment monitoring.
- Quad input digital logging thermometer.
- Accepts J, K, T and E type thermocouples.
- IP67 water and dustproof housing for demanding jobsite conditions.
- Displays T1/T2 or T3/T4 with dual differential readings.
- 9,999 memory position logging with adjustable logging interval.
- USB software download, large backlit display, Min/Max/Avg and Data Hold.
What it helps check
Use the DT304 when multiple temperature points need to be measured or logged over time. It is especially useful when a single reading does not tell the whole story.
- Temperature split, supply air, return air and pipe temperatures.
- Refrigeration performance, heat exchanger checks and process monitoring.
- Recorded temperature data for review, documentation and reporting.
Service applications
Built for HVAC/R, refrigeration, industrial, food service and process monitoring.
The DT304 is suited to technicians who need rugged multi-point temperature measurement with logging. Its IP67 housing, memory logging and USB data transfer make it useful in both field service and controlled monitoring tasks.
Use it for
Multi-point temperature diagnostics and recorded data logging.
Connect up to four thermocouples, view paired channels or differential readings, then log data when temperature trends need to be captured over time.
- Commissioning checks where multiple air or pipe temperatures need to be compared.
- Routine maintenance checks for refrigeration, HVAC/R and industrial equipment.
- Troubleshooting support where recorded temperature trends can reveal intermittent issues.
Dual differential readings
Compare channels without manual calculations.
The DT304 supports paired display modes and differential readings including T1-T2 and T3-T4, helping technicians compare temperature points quickly during service work.
Rugged data logging
Store readings and download them by USB.
With 9,999 memory positions and USB software download capability, the DT304 helps turn field temperature checks into useful logged data for review and reporting.
Use notes
Match the probe type and measurement range to the job.
Always confirm the thermocouple type, probe condition and selected measurement mode before relying on readings. Follow the instruction manual and site procedures when using probes around hot, cold, moving or energised equipment.
Before logging
Set up the logger before leaving it to record.
- Confirm thermocouple type, channel selection and probe placement.
- Set the correct logging interval and clear old stored readings if needed.
- Check battery level and environmental conditions before long logging sessions.
Related test instruments
Linked Kane & UEI products from Omni Tools.
Internal Omni Tools links only — related temperature, psychrometric and HVAC/R test instruments.Useful information & documents
DT304 resources.
Omni Tools product and range links, plus the official UEI DT304 instruction manual.Omni Tools links
Manufacturer documents
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