Help me plzzzzzzzzzz

im new to this, can some body tell me what ppm stands for and how do you measure/change it

come on somebody plz tell me

parts per ----

impatient much?

loudblunts, teach me

parts per million.... do you have anything to measure it with?

i still dont get it? dont understand parts per million what mmmmmmmmmmm, am i just stupid

search like I am...