Hi, i have a few pcs of the Eliwell ID 974 controller for sale... three of them are new and one is used.
They can be configured to override the inaccurate temp controller or to cut off Mh/lightings when if chiller fails..
They are meant for DIY and you ll need quite a bit of elecetrical. The new ones are going at $70 inluding 1 x temp probe and the used one (black box) is going at $65. Interested pls PM, here are the pics.