Just bought one of these for my enlarger. Set my Gralab timer at 60min and use it to count down the needed time with this footswitch. Only 10$ too. Great buy.
Good deal and it'd be great to use for the white light switch as well. May have to order a couple for my darkroom. A newspaper I interned at years ago used something similar in their darkrooms although it worked pushed up or down. I would skip the timer and just get a metronome, which is what the paper used as well. Couldn't have your music blaring but made you more aware of your burning and dodging times.