i just bought rc engineering injectors. my question is this without using a digital multimeter how can i tell if these injectors are peak and hold or saturated type injectors. ive been searching all night and cant find anything. the injectors have three different codes on them. one is r2m-320,second is D1610aa, last is 3208. i thought the r2m-320 was the code to identify them but i put the code into google and nothing comes up. i think this is the right place to post this. let me know i need some help!