Disappointing disillusionment

Unfortunately I let myself convince due to the presentation and external reviews, to buy the product but, instead of listening to the same 1-star reviews.
Preliminary who rated well here, which really seems to be completely irrelevant whether the primary objective of the weather station, namely accurate measurement, is ever implemented correctly.
I agree with the good reviews on at certain points, the workmanship is good, the devices look good, software is working fine and the presentation on the website or app is really great. All in all, but brings nothing if the core competency is measuring total inaccurate.
I had ordered the same me the full package, the main unit (with external module), additional indoor unit and a rain sensor. But due to the 1-star reviews I wanted to know what's really behind it now. So simple experimental setup, three devices, which measure all temperature and humidity, two still show the CO² content.
So I have three Netatmo modules (skin unit, additional indoor unit and outdoor unit) just once placed directly next to each other. Now that you are for a few days, with a very sad result:
Each module shows different values. Now one might say, the temperature values ​​can be in the settings manually kalibrieren.das was my hope.
So I collected everything in the house, what kind of temperature and humidity displays in order to obtain a possible reference. Frightened, positive finding all possible devices (favorable weather station, high-quality device with temperature display and humidity, two radio clocks) showed the exact same temperature until one of the two radio clocks showed a value of + 0.1 ° C. Because I thought so when even create inexpensive radio watches, then why not Netatmo modules
Based on the reference value, I then for days trying to bring the device to a uniform temperature measurement. But no matter how I place if all devices were aligned on the reference and the temperature changes in space the Netatmo Mudule and at this point to check exactly by up to 1 ° C apart, say, a module is eg 23 ° C, another 23.3 ° C 23.8 ° C and the third !!!
One can then try as many times you want to calibrate the temperature. The sensor on the main unit is the worst. First he shows too low a temperature, then to calibrate it up by up to 1.2 ° C, I had already correct, then the temperature rises in the room, and the sensor is 0.5 ° more. So veringern.es again by 0.5 ° C cooler unit shows 0.4 ° C too little an.es is not possible.
Quite bad it is then when it comes to humidity. Here, there is no way for calibration. Reference value was 63%. Result at the three stations: 60%, 64% and 70% with strong fluctuations up and down. A difference of 10% !!! Even if both would go equally inaccurate and it would have been 65%, we are talking about 5% measurement inaccuracy !!!
CONCLUSION: A weather station which can to a self-calibrating needs and then on the other hand shows that it is absolutely inaccurate measures worth any money. When a 20 Funkwecker the better can, what you have ever bought the other product first, then the attempt Netatmo can only be considered as failed.
I find it very sad that the manufacturers offer such a good environment, and then ruin it in such a way as he is not capable of ensuring a reasonable final inspection to check that a device calibrated to leave the factory and measures correctly. That I'm not just in the head. Schade netatmo, I find the idea really great, but so useless.
I'll try the screenshots of measurements to upload, so you still can see it visually.
PS One can sometimes see the great Netatmo map and times take areas where many external modules are available. Sure, here are many dependencies, such as direct sunlight to calculate with, but it is really none of the modules sometimes only approximately a similar value as another, which is a few meters away.