Does what it's supposed to do! I use it with my PH20 and my PC60 (5 function meter). With the PH20, I just keep the probe submerged in 3M. For PC60 I just put a drop or 2 of 3M in the measuring cap and next time I use it I fill the cap with enough 3M to dip the bulb but NOT the 2 black sticks that read EC (TDS) and don't should be submerged in water!
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