I have 4 helix but for my custom incubator I went with a herpstat nd with the blue led display. Herpstat can be set to a tenth of a degree and it shows the power ouput on the display(10%-100%). I am really impressed with the herpstat you get alot more features for the money. I would get a herpstat nd if I was you.You won't be disappointed if you go with a herpstat. :gj: