10, 50, 100 & 200 ppm    
Mid-Level Chlorine Test Strip, 200ppm
The Mid-Level Chlorine test strip from Precision Laboratories provides an easy way to accurately measure Free Chlorine in increments of 0, 25, 50, 100,and 200ppm. This test strip produces a distinct color change over the entire range from blue to brown to orange. This is a great alternative to our Chlorine Test Paper as it is a more accurate measurement of free chlorine. This Chlorine test paper is only a semi-quantitative measurement, meaning it changes darker shades of one color (purple).

Instructions:
Immerse the test strip in the sample and remove immediately.
Hold strip level (do not shake off excess sample).
Compare to the color chart between 5 and 10 seconds after removing the strip from the sample.

Documentation