The SR Aquaristik Speed Test is a portable magnetic stirrer which makes testing quick and simple for most standard titration-style, hydroponic or swimming pool test kits and works well with liquid or dry reagents. This method is more accurate as it is much faster than manually stirring or swirling. It is also battery operated (requires one 9V, included), completely portable with a modern and sleek design. The provided glass test cylinder (beaker) measures 15 ml, prevents staining and remains cleaner than the usual plastic. This stirrer may also be used with many other standard test vials. Maintain pace with the rheostat style variable speed control dial while utilizing the on/off switch. Speed Test will help you obtain the accurate results you have been searching for. 2.75" x 3" x 3"