As the name implies, I purchased this item to test the diesel injectors on my 1979 Ford 3600 Tractor.The DPA injection pump has a minor leak.Before removing and resealing the pump, all old mechanic provided me with this advice."Resealing your pump without testing your injectors is like taking a shower and putting on dirty socks".After chuckling a bit, I realized the wisdom in the advice.The cost of this advice was equal to the value of just (1) of my injectors.Knowing they were all serviceable and in good condition was important before tackling the pump reseal.This device did exactly what it was advertised to do.Since I'm not a full time mechanic....this devise won't see a lot of daily or even weekly use.Like many specialty tools on the market....you buy it for it's one intended purpose and you'll always have it for future use.I would certainly recommend it if you're a DIY mechanic with the knowledge to know what you're doing.
Lorenzo 
