the best timers are the 5 dollar timers at walmart made by brinks. that are the same extact timers you would get from hydrofarms just with out the label. they are a 10amp timer and unless you are plugging your intire grow room into it it works just fine. they can bet set for 10 minute interviles just like any other hydrofarm time...so save the money for the electric bills and go get a brink timer at walmart