I used a LPL digital for enlarging it is not suitable for negatives though.. because of the led display and the rather shorter timing..(2-3mins i beleive)
I use a cheap timer i bought from radioshack that i can operate in total darkness with ease.. does the job

but i forgot to mention i tray develop 4x5 and 8x10 negatives so it will be much different for tank developing 35mm negs..