There is a bit of controversy about dhikr Beads. I use them regularly. Is it bid'ah (innovation)?
Using tasbeeh cannot be considered a bid'ah. The word bid'ah in fact is applied to introducing unsubstantiated and unauthorized additions to the corpus of Islam. When we use tasbeeh we do not introduce any religious practice and hold it binding for all. We employ the beads in some other religiously rewarding activity. A bead is a tool and not an independent worship ritual. It is the same as using paper for recording the Qur'anic text after the invention of paper.