Ok, so I also use my classic Gralab enlarger timer when I'm developing film, sometimes in open trays, which means several minutes in complete darkness. The glow in the dark is great and all, but it just doesn't cut it and I'm finding myself leaving the tray and putting my head 6 inches from the damn thing just to see when my 30 second agitations should commence! Grrr... I thought, golly gee whillikers, if I had some kind of simple audible signal my troubles would be over. And I don't mean a metronome that beeps on the second, which would drive me all the more bonkers. So my question is, has there ever been a count-down timer that accomodates some kind of intermittent signal? However, I think I've got a better idea... I'd like to attach a dangling bell at the top, right above 12 o'clock, so that when the second hand passes it will ring it. Conversely, on the bottom, I'd like to have some thin piece of metal projecting upwards so that it will be "plucked" as the second hand passes. (kinda like a jaw harp) I've attached a piece of Art (note the capital A) to better demonstrate this. Whaddya think? Any good ideas for materials to do this? I can probably throw something together fairly easily, but specifically I'm wondering what a good metal might be for the all important boing, and I need to make sure it doesn't halt the movement of the hand.