Henri 's post of Jan 28, 2:44 PM, Google translates as:The RuuviTag may show the correct temperature, but the RuuviTag attached to the building will be cold for a long time after the air temperature has changed. The temperature of any mass does not change very quickly, even if the temperature of the air changes quickly (for example, snow or ice does not melt immediately when the air becomes warmer). RuuviTag can also be calibrated or changed to display the desired temperature. In the menu in the upper right corner, behind the gear wheel, you can find a setting for changing the measurement values.
paappa53 Replied:
The Ruuvi tag hangs in a plastic bag from the ceiling and is about 50 cm from the walls. The traditional meter is attached to the post, which means that the temperature change of the mass should be visible on it rather than on the Ruuvitag. The phone’s App calibration apparently only takes place on the phone, not on the tag itself. Is it tag specific or does the calibration affect all 3 tags?
Henri replied: Ok, then it shouldn’t matter. Calibration is sensor specific, done in the application and only affects the application. From there just try it in the settings menu, you can always remove the calibration.
Mikko responded with: I haven’t visited the forum in a while. I was about to write about Pro’s flaws when I realized I’m not the only one.
So I have the same problem: the Pro throws 1-2 degrees upwards. I installed two regular ones and one Pro. The two regular ones look exactly the same within a couple of tenths, and the Pro has its own numbers. The ruuvis are next to each other. I thought I could trust Pro , but the two regulars are the majority.
In the fall, I went through a few sensors at home so that I put the Pro (different Pro than above) and the new normal Ruuvi (Ruuvi test, different from the usual one above) next to the old Ruuvi (Ruuvi X, those eight different sensors, one per row) and I waited at least a day. Numbers below. The first column is the temperature of the old sensor, the next of the new Ruuvi (Ruuvi test), the next Pro. The last two columns tell the difference between the Pro and the old sensor, and the difference between the Pro and the new standard.
You can see from the numbers that the Pro and the new Ruuvi are pretty well in line, the difference is at most 0.18 C, but the Pro and the old differ by about a degree.
So I think this is not a matter between Pro and normal, but the difference between the old and the new sensor. But do I need to calibrate all the sensors and by what?
I’ve thought about putting all the sensors in the same place and waiting for a day, after which you’d see where it goes.