Well its best to get a good timer like this:
https://www.greenair.com/browse/timers.html
or
R & M Supply, Inc. - Timers
the ArtDne
If to much scratch get 2 of these:
Hydrofarm - Dual Outlet Grounded Timer
As long is it has 15 min increments you will be fine. I have been hosed to catastrophic levels by shitty timers.
