eco stick not working

I need some help with My PPM EC TDS CF meter, its not working at all and I just got it

OK wait I tried it on my nutrient solution water, and it works with that but not my plain tap watter?

Are you sure its not just faulty?

I think its more me than it I dont know I'm going to retry it in tap watter in a little bit... but all this water testing has got me sober, needs to smokes

its alot bigger than I imagined, and my water is right aqbout where it should be

Well if its working in solution and not in tap water maybe its calibration is incorrect,or its sensitivity is no good.

or you have the cleanest tap water on earth lol.

I have no idea man, I retested it again just now, and still the tapwater doisnt do anything and I mixed new nutrient water, and checked with the ppm they say for a set amount of nutes, and there was only about a 200PPM difference.
but next time I go to the hydro store I'll get ppm calibration solution, thanks guys