Neat Google trick. If you need a metronome, use this search: https://www.google.com/search?q=metronome. Here’s what you see:
Click the play button to start the beat; you can alter the beat by clicking the – and + buttons. Unfortunately, you can’t set the metronome to just any beat; only the intervals that Google seems to like. So you can set it to 120 or 126, but not 128. Still, if you need a quick and easy metronome, this may come in handy.