The Sedgewick Rafter Counting Cell Slide was designed specifically for the quantitative measurement of the exact number of particles in a precise volume of a fluid. The Sedgewick Rafter counting cells are used widely in water analysis, culture inspection and for any other fluid where particles per unit volume must be determined.
An economically priced plastic cell, for one time (or possibly several time) use and for educational/training exercises.
Generally we do not recommended the S50 plastic version for the professional user. The softness of the plastic means it is easily scratched and otherwise damaged. However most laboratories who do use the plastic version see it more as a "throw away" or consumable, which may best suit certain applications.
Coverglass is included.