Micro Essential Hydrion Rain Survey Kit is designed for pH measurements on acid rain surveys and other potentially acid fresh water sources. This kit contains 40 sample tubes, 10 comparator charts and enough test paper for 400 determinations making it suitable for class and group projects. The pH 3.0-6.0 pH test paper is supplied in a double roll jumbo dispenser with a convenient tear-off tab. Another dispenser holding a wide range Insta-Chek 0.0-13.0 pH paper is included for testing ordinary household items. Color charts for each range of paper provide distinct color matches for sample comparison. Total pH Range of 0.0-13.0. Micro Essential Labs #: MIC-RS5150.