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 0.01pH. Whether you want to know the pH of the water in a swimming pool or in an aquarium, this clever device is for you.Poor 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, it's usually too late. With the Voltcraft PH 100 ATC you can check pH in a variety of fluids quickly and reliably.The Voltcraft Digital pH meter PH-100 ATC is a reliable and high resolution pH meter for applications in swimming pools and other water storage areas for quality checking. With this measuring device, you can easily detect how acidic or alkaline a liquid is. The device has a fast response time and low power consumption making it highly effective. With the HOLD function, you can keep the reading on the large LCD if measuring in an awkward situat