Quote Originally Posted by speedbump View Post
Since it doesn't have Rapid Cycling protection which is what kills most Motors, there are other protection devices out there that will do more for probably about the same money.
Yes you need more than one protection device, the one mentioned will shut off the pump when it starts sucking air, i.e. dry well, and shut it off for an adjustable recovery period. I have a Franklin Pump Tec, which does the same thing without the fancy handheld diagnostic device. To avoid rapid cycling you need either to watch your pump and pressure tank operation, or I've see two or more bladder tanks in parallel that will save the pump as long as you check them from time to time to see if one is waterlogged.