Great unit, especially for the price. I pop tested and adjusted the pressures on all 6 injectors for my 12v Cummins without a hitch. The guage was accurate enough to get all injectors within 2-3 bar overall. It's well built, and a lot heavier than I expected. The only issue I had was that the "shutoff valve" (fine pressure control) began leaking. I was able to replace the o-ring with one of the supplied spares and the leak was resolved. I highly recommend this unit.
Michael 
