These Nozzle testers are used to adjust the injector nozzle opening pressure, nozzle seat tightness and to carry out leakage tests, spray pattern atomization repetition tests and chatter characteristic tests. Excellent high quality testers that come with a warranty of 1 year. Please note that we have sold over 120 pieces of this model nozzle tester on eBay itself over the last 18 months with excellent feedback from worldwide, this is a new listing due to eBay listing policy changes. They undergo pressure build up test, fuel leakage test, pressure gauge accuracy test etc. This is done to ensure that our quality standards are always met. They are tested with diesel fuel under the same conditions as they would be under normal use. We are the manufacturers and exporters of diesel fuel inject.