Adequate, but no tip device

I have this heart rate monitor from Hama ordered because I have only just begun actively with the running and, therefore, wanted to try if I can start with such a device something or not. According to my expectations were not very high. Adjusting the chest belt was no problem, even when running it remains in place. The operation of the clock, I felt as though somewhat complicated, especially as the guide kept rather minimalist and is not designed necessarily clear. After a little Herumprobiererei but went also. So far so good. Now for their actual purpose, namely the pulse measurement: Do not know if it's just me, but the clock shows quite often absolute nonsense to (resting heart rate of 110, etc.). Have the display also checked several times, as I have just measured it by hand. Although my pulse on your wrist is really hard to find, because the clock yes but attaches via the belt that really should not be a problem - but it is unfortunately yet. Perhaps this is my very low blood pressure, but I lack the Comparison to another device. To remove the Trainigszeiten the clock is right for me, but as a heart rate monitor I use no longer it.