Voltcraft ph 100 atc ph meter voltcraft yk 21ph w pe 03 the voltcraft ph 100 atc is a handy ph meter with a resolution of 001ph whether you want to know the ph of the water in a swimming pool or in an aquarium this clever device is for youpoor water values are often the cause of fish death poor plant growth or for failed experiments in the school or laboratory and when the consequences of poor water quality become apparent its usually too late with the voltcraft ph 100 atc you can