Stanley Hydraulic Tools

Was given some hydraulic hand tools to find a new home, not sure what there worth but there for underwater use as far as I can tell.... all older Stanley tools, there is an impact driver, a chisel hammer, and I believe the third one is a sander or grinder. I guess this is a question as well as a for sale add. Anyone know what there worth and what they are exactly? Is anyone interested and want to make an offer.