Hanna Checkers


The Hanna Checker® HC ( Handheld Colorimeter ) bridges the gap between simple chemical test kits and professional instrumentation. Chemical test kits are not very accurate and only give 5 to 10 points resolution while professional instrumentation can cost hundreds of dollars and can be time consuming to calibrate and maintain. The Checker® is both accurate and affordable.

A colorimeter is a device that can measure light transmitted through ( or absorbed by ) a liquid. Since addition of a specific chemical reagent to a solution containing the target substance may cause the sample to become colored, a colorimeter measures the light ( often that produced by a monochromatic light source as a light-emitting diode, or LED ) absorbed/transmitted by the colored solution after the zero reference of a non-colored ( blank ) solution has been made. Hence the concentration can be calculated by the instrument's programmed logic. If you have any questions about the different varieties Hanna Checkers®, please feel free to contact us.