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Digital thermometer DT-509

Multifunctional thermometer with the ability to measure temperature and relative humidity.

Categories: Digital thermometers


Digital thermometer DT-509 is used to measure the temperature of different medium, relative humidity of the air by direct contact of the probe with measurement object. 9 memory cells allow this device to record and store the measurements necessary for the operator.

Digital thermometers consist of electronic unit and replaceable probes.

As thermosensitive elements in probes thermocouples are used.

As measuring element in relative humidity probes capacitive humidity sensors are used.

  • Measuring the temperature with resolution 0,1°С.
  • Measuring the relative humidity with resolution 0,1%.
  • Changeable probe.
  • 9 memory cells for storing measurement readings.
  • Displaying the temperature of the thermal compensation sensor on the screen.
  • Displaying the air temperature when using the humidity probe.
  • Fixating measured temperature and humidity in the device's memory.
  • Displaying the average temperature and humidity for a given number of measurements.
  • Displaying the maximum temperature and humidity (for a given number of measurements).
  • Displaying the minimum temperature and humidity (for a given number of measurements).
  • Setting measured temperature and humidity limits.
  • Sound indication after reaching the set level of measured temperature and humidity.
  • 1 year manufacturer's warranty.
  • Powered by standard AA batteries.


DT-509 is used for highly precise measurement of temperature and humidity by direct contact with the measurement object.

Due to the possibility of changing the probe, measurements can be carried out for almost any media: liquid, dry, solid.

9 memory cells allows you to save the most important measurements and choose the conditions under which the device will record them.

Improved devices allow using high-precision probes for:

  • high-precision surface measurements;
  • high-precision air temperature measurements;
  • work with thermocouples of types K, L, B, R, S;
  • simultaneous high-precision measurement of temperature and humidity.


All DT-5 digital thermometers are calibrated and certified as measurement instruments in Russia, Kazakhstan, Belarus.

Contact us if you want to check id DT-5 are certified for your country.

Specifications thermometer DT-509

Parameter Value
Measured temperature range -100...+1800 (depends on the type of used probe)
Relative instrumental error ±0.5% + least significant digit value
Resolution 0.1°C
Number of replaceable probes types 24
Measured relative humidity range, % 0...100
Absolute instrumental error of relative humidity measurement, % 3
Terms of use -20...+50°C
Relative humidity less than 80% at T=35°C
Atmospheric pressure 86...106 kPa
Voltage 1.5x2 V

Basic set

1 Digital thermometer DT-509 - 1
2 1.5 V battery, type AA - 2
3 Operation manual (in English) - 1
4 Packaging - 1


1 Battery charger for AA batteries
2 Battery AA 1.2 V (2850 mA)
3 Case 53141 for a thermometer with 1 probe
4 Case 53142 for a thermometer with 2 probes
5 Case 53143 for a thermometer with 3 probes
6 Case 53134 for thermometer with 4 probes


Digital thermometers DT-504, DT-506, DT-509, DT-511

Review of digital thermometers DT-504, DT-506, DT-509, DT-511.

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