1. A method of determining concentration of a chemical species in industrial cooling water, the method comprising: exposing a reactive zone of a chemical test strip to industrial cooling water thereby creating a post-exposure reactive zone; imaging the post-exposure reactive zone using an imaging device thereby creating a digital image of the post-exposure reactive zone; optionally cropping the digital image of the post-exposure reactive zone to isolate a portion of the digital image for analysis; analyzing a colorimetric parameter of at least the portion of the digital image of the post-exposure reactive zone using image analyzing software to determine the concentration of the chemical species; and optionally outputting the determined concentration of the chemical species of the industrial cooling water.