just needed one iPhone

it seems working

I found this in the web: look here: www . tube . com /watch?v=blOdenW6veE&feature=youtu.be I put this app in my Iphone, it seems working itunes . apple . com /us/app/washspeed/id588527777?l=it&ls=1&mt=8

Hallo, I have a washing machine Siemens E-Nr. WM 14Q4R0 with maximum speed of 1400 rpm. But I am afraid that sometimes the speed is automatically reduced to lower limit. I don´t like this, I want the my washing machine always reaches the maximum speed because I spent a lot of money for it. is there a simple way to measure the speed of the drum? stroboscope light can be a way? or other ways? I thank you for your help bye