the primo ppm meter is very easy to use. put it in the solution, then turn it on, and it will give you the reading in ppm's in seconds. the box says to store it in tap water only, never in ro, or distilled, only tap. also, the milwaukee ph pen states the same; only tap water.
i change the tap about 2-3 times a week that i store these meters in. they are actually right in front of me at my pc, so i remember to change it.
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I wasnt aware you needed to store them in water. I never used the ppm meter yet and the Hanna PH meter says to put a moist paper towel inside the cap of the meter to store.
CAN YOU POST A PIC of how you store these in water?
Are they in a jar, cup? you cant let go water go above the line so how do you store them in water?
Thanks in advance