Even if such a thing exists, I think it would be very hard to calibrate: if, for example, you're playing a bar of 4 with a straight 1/8th note groove at 100 bpm then it would be unlikely that you'd be striking anything 100 times during that minute. I mean, if you're playing 1/8th notes on the hi-hat/ride then at 100 bpm you will play 200 1/8th notes in that minute. If the bass drum is on the 1 and 3 and the snare is 2 and 4 then each will only be played 50 times in a minute. So any such device would have no way of telling that you're going for 100 beats per minute. Unless, of course you play a bass drum on all 4 beats of the bar which is what used to happen a lot in disco music.
If you want to find a way of making your time keeping consistent then I recommend simply playing to a click as much as possible until you body and brain get used to the idea. You'll never be as perfect as a machine, but then would you want to be?
Good luck.