As I am going through my library of diving books i realize that it is time to sell these valuable manuals from Scubapro. The first one is the first Scubapro Technical Service Manual I got when I became a Scubapro deal in the 90's. Good old Pete Wolfinger was my rep for one year before he retired. This manual was authored by Pete, who later on took a lot of the information he had in this manual and published his book "Regulator Savy". I got so many updates in the first two years I had to split the manual into 2 binders. The other three publications are Technical Education Workbooks. They were used to review the regulator lines and the updates they have made to parts to improve their regulator line. I have attended so many repair clinics in the 30 years I was in business and I can say from my experience Scubapro always had the best clinics. Up to 2 years ago they still have the same format. The last Workbook I have is my Expert Tec Seminar Schematics "Jewels from Jules" It is an update on what parts are still available from SP. Good source of information if you have an older reg from Scubapro. I am selling the all 4 publications as one and won't split them up. $80 plus shipping (these are books and they are heavy, I will ship media books to save $) I prefer to sell to the US only because it is a hassle to ship outside the US. Just PM on SB.