It Looks okay especially with a solid state relay. It looks like it is rated for 40 amps, so check your existing kiln for amp rating you may be able to get a higher rating from them. You will have to make your own program as It doesn't have the features of an Orton programmer, or any other programmer meant specifically for potters. Which means no sensing that the kiln is firing faster or slower than intended so no compensation for this and
no guarantee of the proper heat work. Also all you are getting are the parts, you will have to mount them in an electrical box and run the power cord plus have a receptacle for your existing kiln to plug into the box. But you could still make a program of your own that will give good heat work, but be carefull as to how you program for the last 200 deg F because this controller will not adjust the ramp or time in case your kiln can't go at 108F or 120 F ramp that some controllers use in there glaze programs. This is made in China so I would want to be sure of what kind of support you can get. There are plenty of American made pid controllers available but in most cases they are for industry and they don't sell a package of parts for pottery kilns, that is for you the customer to choose.