knowledgable users of advanced nutrients products!!!

if i use advanced nutrients fertilizers, and use them correctly do i have to worry about too much or too less of any element such as phosphorus potassium and nitrogen

No, as long as you follow the directions, and use proper nutes, like veging or flowering nutes at less than 100%, your levels will be fine, and theres no need for ppm pen. Dont nute everytime, water feed water ..