About the Thermometer

More Info » About the Thermometer

I built two major versions for the thermometer-hygrometer:

Temperature in Fahrenheit degrees,
Last digit displays “F” for temperature, “H” for humidity.

Temperature in Celsius degrees,
Last digit displays “℃” for temperature, “%” for humidity.

And a special version for both standards, an additional switch for change in the back of the unit.

Some characteristics:

  • Precision sensor DHT22 (0-100% humidity readings with 2-5% accuracy; -40 to 125°C temperature readings ±0.5°C accuracy);
  • Safe design, tubes are not directly exposed, they are protected by the Plexiglas, so it can be exposed even in homes with small children;
  • Cathode Anti Poisoning routine included slot machine effects 3 times/hour boot testing of each digit for prolonged lifetime of the tubes;
  • Stabilized high voltage for tubes, high efficiency power supply, low heat and long life;
  • 3*IN14 tubes and one IN19A (for Celsius degrees) or IN19B (for F degrees)
  • Power supply is universal adapter 100-230V input, 12V stabilized output, included in the package, 2.1mm jack.


Any questions are welcome.
If you have an idea, please send me a message,
Sometimes it’s easier that it seems!
Thank you!