Nice, but very inaccurate

Positives:
Super easy operation lies comfortably in the hand.
Negatives:
The accuracy is rather poor:
When I repeatedly measure the same place, always come out different results.
Example:
My laminate floor is the one time 17 degrees. Three minutes later only 12 degrees.
My skin surface is 31 degrees Celsius, 3 minutes later, only 27 degrees.
My terrace is from the 1st floor measuring 5 degrees. From the terrace there are measured then only 1 degree.
My energy saving lamp is 47 times was level, then only 35 degrees, then 50 degrees ...
It seems to me that the measurement results are also influenced by the previous measurement. Fair I have something, after which cold, then the first again, then the new measured temperature is lower than previously.
Summary, one can say:
Much more than you should know that: Pretty hot, very cold, it is not. Much more accurate than my feeling it is not, the measurement uncertainty is already enormous ...
Well, was also not expensive.