darkroom clock

Where I live it's hard to come by decent enlarger timers, and when you do find one they're often really pricy. Being cheap, I experimented with using my phone to control the enlarger by plugging it into a wifi plug and writing an app that turns the plug on and off with a timer and since then...

I have the basic Auxomat 5 enlarger which is powered by the bulb with a simple on and off switch. I am looking to find a clock. Which clock should I buy and how do I install? Thank you!