I had bought this seperate from my SolarMax 40 prior to them being included as they are sold today. When I bought my SolarMax 40 a year ago they were $995 without this VERY NECESSARY item. Now, this included, the SolarMax 40 cost $1281! Talk about an expensive addition. If you already have the SolarMax heres you chance to save some moeny. You want it, I am asking only $135 shipped to your door. I had it on my scope 2 times.