This part of SAE J968 specifies two types of calibrating nozzle and holder assemblies intended for the testing and setting of diesel injection pumps on test benches. It applies to: a A calibrating nozzle and holder assembly with a single hole orifice plate; b A calibrating nozzle and holder assembly with a delay pintle type nozzle. The approximate range of the calibrating nozzle and holder assembly is up to: a 300 mm3/stroke with the single hole orifice plate; b 150 mm3/stroke with the delay pintle type nozzle. Setting and maintenance requirements are specified in ISO 4008/3.